The nine-dash line, also referred to as the eleven-dash line by
Taiwan
Taiwan, officially the Republic of China (ROC), is a country in East Asia. The main geography of Taiwan, island of Taiwan, also known as ''Formosa'', lies between the East China Sea, East and South China Seas in the northwestern Pacific Ocea ...
, is a set of line segments on various maps that accompanied the claims of the
People's Republic of China
China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...
(PRC, "
Mainland China
"Mainland China", also referred to as "the Chinese mainland", is a Geopolitics, geopolitical term defined as the territory under direct administration of the People's Republic of China (PRC) in the aftermath of the Chinese Civil War. In addit ...
") and the
Republic of China
Taiwan, officially the Republic of China (ROC), is a country in East Asia. The main geography of Taiwan, island of Taiwan, also known as ''Formosa'', lies between the East China Sea, East and South China Seas in the northwestern Pacific Ocea ...
(ROC, "Taiwan") in the
South China Sea
The South China Sea is a marginal sea of the Western Pacific Ocean. It is bounded in the north by South China, in the west by the Indochinese Peninsula, in the east by the islands of Taiwan island, Taiwan and northwestern Philippines (mainly Luz ...
. The contested area includes the
Paracel Islands
The Paracel Islands, also known as the Xisha Islands () and the Hoàng Sa Archipelago (), are a disputed archipelago in the South China Sea and currently controlled by the People's Republic of China.
The word ''paracel'' is of Portuguese origi ...
, the
Spratly Islands,
the
Pratas Island and the Vereker Banks, the
Macclesfield Bank, and the
Scarborough Shoal. Certain places have undergone
land reclamation
Land reclamation, often known as reclamation, and also known as land fill (not to be confused with a waste landfill), is the process of creating new Terrestrial ecoregion, land from oceans, list of seas, seas, Stream bed, riverbeds or lake ...
by the PRC, ROC, and Vietnam.
The ''
People's Daily
The ''People's Daily'' ( zh, s=人民日报, p=Rénmín Rìbào) is the official newspaper of the Central Committee of the Chinese Communist Party (CCP). It provides direct information on the policies and viewpoints of the CCP in multiple lan ...
'' of the PRC uses the term (''Tuan-hsü-hsien''; ) or (''Nan-hai tuan-hsü-hsien''; ; ), while the ROC government uses the term (''Shih-i-tuan hsien''; ; ).
A 1946 map showing a U-shaped eleven-dash line was first published by the
Republic of China
Taiwan, officially the Republic of China (ROC), is a country in East Asia. The main geography of Taiwan, island of Taiwan, also known as ''Formosa'', lies between the East China Sea, East and South China Seas in the northwestern Pacific Ocea ...
government on 1 December 1947. In 1952,
Mao Zedong
Mao Zedong pronounced ; traditionally Romanization of Chinese, romanised as Mao Tse-tung. (26December 18939September 1976) was a Chinese politician, revolutionary, and political theorist who founded the People's Republic of China (PRC) in ...
of the PRC decided to remove two of the dashes in the
Gulf of Tonkin amid warming ties with
North Vietnam
North Vietnam, officially the Democratic Republic of Vietnam (DRV; ; VNDCCH), was a country in Southeast Asia from 1945 to 1976, with sovereignty fully recognized in 1954 Geneva Conference, 1954. A member of the communist Eastern Bloc, it o ...
.
However, the ROC government still uses the eleven-dash line.
In 2013, some were surprised by a tenth dash to the east of Taiwan, but it had been present in PRC maps since as early as 1984.
, the PRC government had not clarified what it specifically claims in the map,
but it did issue further partial clarification in 2024, saying this was an ongoing process.
On 12 July 2016, an
arbitral tribunal organized under the
United Nations Convention on the Law of the Sea (UNCLOS) concluded that China had not exercised exclusive and continuous control over the area and that certain maritime features lie within the
exclusive economic zone of the Philippines. It did not rule on matters of territorial sovereignty. , 27 governments had called for the ruling to be respected.
It was rejected by eight governments, including China (PRC) and Taiwan (ROC).
History of the line segments

In December 1947, the Ministry of Interior of the
Nationalist government
The Nationalist government, officially the National Government of the Republic of China, refers to the government of the Republic of China (1912–1949), Republic of China from 1 July 1925 to 20 May 1948, led by the nationalist Kuomintang (KMT ...
released "Location Map of South Sea Islands" () showing an eleven-dash line.
Scholarly accounts place its publication from 1946 to 1948 and indicate that it originated from an earlier one titled "Map of Chinese Islands in the South China Sea" () published by the ROC Land and Water Maps Inspection Committee in 1935.
Beginning in 1952, the
People's Republic of China
China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...
(PRC) used a revised map with nine dashes, removing the two dashes in the Gulf of Tonkin. The change was interpreted as a concession to the newly independent
North Vietnam
North Vietnam, officially the Democratic Republic of Vietnam (DRV; ; VNDCCH), was a country in Southeast Asia from 1945 to 1976, with sovereignty fully recognized in 1954 Geneva Conference, 1954. A member of the communist Eastern Bloc, it o ...
; the maritime border between PRC and Vietnam in the Gulf of Tonkin was eventually formalized by treaty in 2000.
After
retreating to Taiwan in 1949, the
ROC government continued to claim the Spratly and Paracel Islands. President
Lee Teng-hui claimed that "legally, historically, geographically, or in reality", all of the South China Sea and Spratly islands were ROC territory and under ROC sovereignty, and denounced actions undertaken there by the Philippines and Malaysia. Taiwan and China have the same claims and have cooperated with each other during international talks involving the Spratly Islands.
In May 2009, Malaysia and Vietnam submitted claims to the UN Commission on the Limits of the Continental Shelf to extend their respective continental shelves.
In objection, the PRC communicated two Notes Verbales to the
UN Secretary General stating:
Its submissions were accompanied by maps depicting nine dashes in the South China Sea.
Immediately afterwards, Malaysia and Vietnam protested China's submission. Indonesia followed suit a year later, and the Philippines two years later.
In 2011, the PRC submitted another to the UN conveying a similar message but without mentioning the line.
Although not visible on the 2009 map, modern Chinese maps since 1984, including the vertically oriented maps published in 2013 and 2014, have also included a tenth dash to the east of Taiwan.
Some were nonetheless surprised when the tenth dash appeared in a 2013 map, even though it was not in the South China Sea.
Meanwhile, the ROC (Taiwan) has rejected all rival claims to the Paracel islands, repeating its position that all of the Paracel,
Spratly,
Zhongsha (
Macclesfield Bank grouped with
Scarborough Shoal) and
Pratas Island belong to the ROC along with "their surrounding waters and respective seabed and subsoil". Taiwan views other claims as illegitimate, releasing a statement through its Ministry of Foreign Affairs stating "there is no doubt that the Republic of China has sovereignty over the archipelagos and waters".
On September 9, 2020,
Wang Yi, State Councilor and Foreign Minister of China, stated that China does not claim all the waters within the nine-dash line as internal waters and territorial waters, and claimed that such accusations are unfounded, deliberately confuse different concepts, and are a distortion of China's position.
In 2023, re-publication of the line in a map from
China's Ministry of Natural Resources drew protests from the Philippines, Taiwan, Vietnam, Malaysia, and Japan.
Analysis
The nine-dash line has been used by the PRC inconsistently and with ambiguity.
It is not clear whether the map constitutes a part of China's historical claims or serves only illustrative purposes. The PRC has not clarified the line's legal nature in terms of how the dashes would be joined and which of the maritime features inside are specifically being claimed.
Analysts from the U.S. Department of State posit three different explanations—that it indicates only the islands within are being claimed, that a maritime area including other features are being claimed, or that a claim is being made as historical waters of China. A claim to only the islands and associated rights is most consistent with past PRC publications and statements, whereas the other two arguments would put China's claim at greater conflict with the UNCLOS.
China's actual claim likely does not include all or most of the waters in the region and appears to center around island features and whatever entitlements that are associated with them, including non-exclusive fishing rights.
Ongoing disputes

According to former Philippine President
Benigno Aquino III, "China's nine-dash line territorial claim over the entire South China Sea is against international laws, particularly the
United Nations Convention of the Laws of the Sea (UNCLOS)".
Vietnam also rejects the Chinese claim, citing that it is baseless and contrary to UNCLOS.
The line is often referred to in Vietnam as ().
Parts of China's nine-dash line overlap Indonesia's
exclusive economic zone
An exclusive economic zone (EEZ), as prescribed by the 1982 United Nations Convention on the Law of the Sea, is an area of the sea in which a sovereign state has exclusive rights regarding the exploration and use of marine natural resource, reso ...
near the
Natuna islands
Natuna Regency is an islands regency located in the northernmost part of the Province of Riau Islands, Indonesia. It contains at least 154 islands, of which 127 of them are reported as uninhabited. This archipelago, with a land area of 1,978.4 ...
. Indonesia believes China's claim over parts of the Natuna islands has no legal basis. In November 2015, Indonesia's security chief
Luhut Binsar Pandjaitan said Indonesia could take China before an international court if Beijing's claim to the majority of the South China Sea and part of Indonesian territory is not resolved through dialogue.
Researcher Sourabh Gupta questioned the applicability of the United Nations Convention on the Law of the Sea to the dispute, arguing that the convention does not support claims based on sovereignty or title, and instead supports the right to continue using the waters for traditional purpose such as fishing.
A 2012 Chinese eighth-grade geography textbook includes a map of China with the nine-dash line and the text "The southernmost point of our country's territory is Zengmu Ansha (
James Shoal) in the
Nansha Islands." Shan Zhiqiang, the executive chief editor of the
Chinese National Geography magazine, wrote in 2013: "The nine-dashed line ... is now deeply engraved in the hearts and minds of the Chinese people."
According to a
leaked diplomatic cable from September 2008, the United States Embassy in Beijing reported that a senior Chinese government maritime law expert said he was unaware of the historical basis for the nine dashes.
At the Conference on Maritime Study organized by the US-based
Center for Strategic and International Studies
The Center for Strategic and International Studies (CSIS) is an American think tank based in Washington, D.C. From its founding in 1962 until 1987, it was an affiliate of Georgetown University, initially named the Center for Strategic and Inte ...
(CSIS) in June 2011, Su Hao of the
China Foreign Affairs University in Beijing delivered a speech on China's sovereignty and policy in the South China Sea, using history as the main argument. However, Termsak Chalermpalanupap, assistant director for Program Coordination and External Relations of the
ASEAN Secretariat, said: "I don't think that the 1982 United Nations Convention on the Law of the Sea (UNCLOS) recognizes history as the basis to make sovereignty claims". Peter Dutton of the US
Naval War College
The Naval War College (NWC or NAVWARCOL) is the staff college and "Home of Thought" for the United States Navy at Naval Station Newport in Newport, Rhode Island. The NWC educates and develops leaders, supports defining the future Navy and associa ...
agreed, saying, "The jurisdiction over waters does not have connection to history. It must observe the UNCLOS." Dutton stressed that using history to explain sovereignty erodes the rules of the UNCLOS.
It is understood that China ratified the UNCLOS in 1996.
Maritime researcher Carlyle Thayer, emeritus Professor of Politics of the
University of New South Wales, said that Chinese scholars using historical heritage to explain its claim of sovereignty shows the lack of legal foundation for the claim under international law. Caitlyn Antrim, executive director, Rule of Law Committee for the Oceans of the US, commented that "The U-shaped line has no ground under the international law because
hehistorical basis is very weak". She added "I don't understand what China claims for in that U-shaped line. If they claim sovereignty over islands inside that line, the question is whether they are able to prove their sovereignty over these islands. If China claimed sovereignty over these islands 500 years ago and then they did not perform their sovereignty, their claim of sovereignty becomes very weak. For uninhabited islands, they can only claim territorial seas, not exclusive economic zones (EEZ) from the islands".
Wu Shicun, president of China's National Institute for South China Sea Studies, claimed that today's international law "cannot overwrite existing facts of the past".
In 2020,
Voice of America reported that China has been putting out "constant reminders" of the nine-dash line in scholarly journals, maps, T-shirts, and films over the past decade. Jay Batongbacal, a professor at the
University of the Philippines
The University of the Philippines (UP; ) is a Higher education in the Philippines#State universities and colleges, state university system in the Philippines. It is the country's national university, as mandated by List of Philippine laws, Re ...
, called them "subtle propaganda". Gregory Poling, director of the Asia Maritime Transparency Initiative at the
Center for Strategic and International Studies
The Center for Strategic and International Studies (CSIS) is an American think tank based in Washington, D.C. From its founding in 1962 until 1987, it was an affiliate of Georgetown University, initially named the Center for Strategic and Inte ...
, said the target audience is third-world countries. A researcher at the
Diplomatic Academy of Vietnam expressed her own observations that the publication of the nine-dash line in scientific journals has increased since 2010, namely in articles from China. According to some scholars, the inclusion of the U-shaped line in maps is required by Chinese law.
''Nature'' has stated that it remains neutral regarding any jurisdictional claims published in the journal. It has asked authors to depoliticize their work and mark controversial designations, and its editors reserve the right to label disputed claims.
Elsevier
Elsevier ( ) is a Dutch academic publishing company specializing in scientific, technical, and medical content. Its products include journals such as ''The Lancet'', ''Cell (journal), Cell'', the ScienceDirect collection of electronic journals, ...
indicated that the legality of the nine-dash line is disputed.
Arbitral tribunal's ruling
In January 2013, the Philippines initiated arbitration proceedings against China under the United Nations Convention on the Law of the Sea (UNCLOS) over a range of issues, including the latter's historic rights claims inside the nine-dash line.
A tribunal of arbitrators constituted under Annex VII of
UNCLOS appointed the
Permanent Court of Arbitration (PCA) as the registry to the proceedings.
The Philippines' initiation of the arbitration was followed by extensive internal debates among Chinese policymakers about whether China should participate in the arbitration.
Participating and losing could impact domestic sentiment and might have regional implications for China's other maritime territorial claims.
The nine-dash line predated UNCLOS, and its lack of defined coordinates was a weakness under current international law.
Chinese policymakers had previously sought to preserve the ambiguity of its status in an effort to preserve the status quo and manage its claims and relations with neighbors.
Policymakers were also reticent because of concerns that the proceedings would not be fair, citing the fact that the president of ITLOS,
Shunji Yanai, was Japanese.
Some policymakers also were concerned about the procedure given that China had no precedent for using arbitration to resolve territorial disagreements.
Others favored participation in order to be able to shape the proceedings, including because only by participating would China have the ability to appoint an arbitrator to the panel.
On 12 July 2016, the tribunal ruled in favor of the Philippines on most of its submissions. While it would not "rule on any question of sovereignty over land territory and would not delimit any maritime boundary between the Parties", it concluded that China had not exercised exclusive control over the waters within the nine-dash line historically and has "no legal basis" to claim "historic rights" to the resources there.
It also concluded that China's historic rights claims over the maritime areas (as opposed to land masses and territorial waters) inside the nine-dash line would have no lawful effect beyond what it is entitled to under the UNCLOS.
China rejected the ruling, calling it "ill-founded"; its
paramount leader
Paramount leader () is an informal term for the most important Supreme leader, political figure in the China, People's Republic of China (PRC). The paramount leader typically controls the Chinese Communist Party (CCP) and the People's Liberatio ...
Xi Jinping
Xi Jinping, pronounced (born 15 June 1953) is a Chinese politician who has been the general secretary of the Chinese Communist Party (CCP) and Chairman of the Central Military Commission (China), chairman of the Central Military Commission ...
said that "China's territorial sovereignty and marine rights in the South China Sea will not be affected by the so-called Philippines South China Sea ruling in any way", but China was still "committed to resolving disputes" with its neighbors.
China's grounds for rejecting the ruling include its decision to exclude itself from the compulsory arbitration provisions of UNCLOS when it ratified UNCLOS in 2006.
Immediately following the ruling, China released a number of documents reaffirming their claims in four specific areas: sovereignty over all the islands in the South China Sea; internal waters, territorial seas and contiguous zones of those islands; EEZs and continental shelfs of these islands; and historical rights. These documents did not mention the nine-dash line in relation to the claims. The
Australian Strategic Policy Institute
The Australian Strategic Policy Institute (ASPI) is a defence and strategic policy think tank based in Canberra, Australian Capital Territory, founded by the Australian government, and funded by the Australian Department of Defence along with o ...
commented, "The quiet disappearance of the ‘nine-dash line’ from China's official claims is a major policy change
..implying that China doesn't take it as a territorial demarcation line—that is, China doesn't claim 90% of the South China Sea as ‘a Chinese lake’, as is so often alleged in international media."
Taiwan, which currently administers
Taiping Island, the largest of the Spratly Islands, also rejected the ruling and deployed a
coast guard
A coast guard or coastguard is a Maritime Security Regimes, maritime security organization of a particular country. The term embraces wide range of responsibilities in different countries, from being a heavily armed military force with cust ...
vessel to the island/rock, with a naval frigate mission also scheduled.
Academic
Graham Allison observed in 2016, "None of the five permanent members of the UN Security Council have ever accepted any international court's ruling when (in their view) it infringed their sovereignty or national security interests. Thus, when China rejects the Court's decision in this case, it will be doing just what the other great powers have repeatedly done for decades."
Media appearances and reactions
The
DreamWorks Animation
DreamWorks Animation LLC (DWA, also known as DreamWorks Animation Studios or simply DreamWorks) is an American animation studio, owned by Comcast's NBCUniversal as part of Universal Pictures, a division of Universal Studios, Inc, Universal Stud ...
-
Pearl Studio animated film
''Abominable'' included a scene with the nine-dash line, which generated controversy in the
Philippines
The Philippines, officially the Republic of the Philippines, is an Archipelagic state, archipelagic country in Southeast Asia. Located in the western Pacific Ocean, it consists of List of islands of the Philippines, 7,641 islands, with a tot ...
,
Vietnam
Vietnam, officially the Socialist Republic of Vietnam (SRV), is a country at the eastern edge of mainland Southeast Asia, with an area of about and a population of over 100 million, making it the world's List of countries and depende ...
and
Malaysia
Malaysia is a country in Southeast Asia. Featuring the Tanjung Piai, southernmost point of continental Eurasia, it is a federation, federal constitutional monarchy consisting of States and federal territories of Malaysia, 13 states and thre ...
although the film was simply depicting maps as sold in China. The Philippines and Vietnam banned the film, and Malaysia followed suit after the producers refused to cut the scene.
In 2019, an
ESPN
ESPN (an initialism of their original name, which was the Entertainment and Sports Programming Network) is an American international basic cable sports channel owned by the Walt Disney Company (80% and operational control) and Hearst Commu ...
broadcast used a map that appeared to endorse China's claims to Taiwan and the nine-dash line, causing controversy.
In 2021,
Netflix
Netflix is an American subscription video on-demand over-the-top streaming service. The service primarily distributes original and acquired films and television shows from various genres, and it is available internationally in multiple lang ...
pulled TV series ''
Pine Gap'' from its Vietnamese service, following an order from the country's Authority of Broadcasting and Electronic Information, as a map with the nine-dash line was briefly shown in two episodes of the series. TV series ''
Put Your Head on My Shoulder'' was also pulled from Vietnam, after the nine-dash line appeared briefly on the ninth episode of the series. The country's Authority of Broadcasting and Electronic Information released a statement that Netflix had angered and hurt the feelings of the entire people of Vietnam.
On 12 March 2022, Vietnam Film Authority banned the movie ''
Uncharted'' because it contained an image of a nine-dash line map. By April 27, the Philippines followed suit.
On 5 July 2023, Vietnam's
Ministry of Culture, Sports and Tourism has announced that it had ordered an inspection of the official website of IME, a talent management and event organising company based in Beijing, China, for allegedly featuring the nine-dash line in the map of East and Southeast Asia. On the following day, 6 July, Brian Chow, the CEO of IME, stated that it was an "unfortunate misunderstanding", but added that the company was committed to replace the images in question. At the time of the controversy, IME has scheduled two concerts of
Blackpink (a South Korean girl band managed by
YG Entertainment) in Hanoi, Vietnam, as a part of the
Born Pink World Tour, and some Vietnamese
netizen
The term ''netizen'' is a portmanteau of the English words ''internet'' and ''citizen'', as in a "citizen of the net" or "net citizen". It describes a person actively involved in online communities or the Internet in general. s called for a boycott of the concerts or any event organised by IME.
On 10 July 2023, Vietnam's Department of Cinema has ordered Netflix and FPT Telecom to remove Chinese drama series from their platforms within 24 hours; the department found the appearances of the nine-dash line in nine episodes. FPT Telecom already blurred the maps in question for its service, but was ordered to take down the entire series nonetheless.
Map drawing in ''Barbie''
On 3 July 2023, Vietnam banned the live-action ''
Barbie
Barbie is a fashion doll created by American businesswoman Ruth Handler, manufactured by American toy and entertainment company Mattel and introduced on March 9, 1959. The toy was based on the German Bild Lilli doll, Bild Lilli doll which Hand ...
'' film, alleging that scenes in the film display the nine-dash line map over the South China Sea. The ''
Tiền Phong'' newspaper reported that the nine-dash line appears multiple times in the film. Regarding one scene that features a child-like drawing of a world map with dashed lines, the film's distributor,
Warner Bros., defended these claims by stating that the map is a children's drawing and has no intended meaning. On 11 July, the Philippines'
Movie and Television Review and Classification Board
The Movie and Television Review and Classification Board (MTRCB; ; is a Philippine government agency under the Office of the President of the Philippines that is responsible for the classification and review of television programs, motion p ...
allowed the film to be screened in the country, but requested Warner Bros. to "blur the controversial lines in order to avoid further misinterpretations". It said the line, which was part of Barbie's journey from her fictional universe to the "real world", was not U-shaped and did not have nine dashes. Other dashed lines can be seen near the United States, Greenland, Brazil and Africa.
Speaking to
Voice of America on Vietnam's ban of the 2023 ''Barbie'' film, Trịnh Hữu Long (founder of the research group Legal Initiatives for Vietnam) said "The
Vietnamese government is surely using legitimate nationalist reasoning to strengthen its entire censorship system," while Michael Caster at the free expression group
Article 19 said "Maps are political, and borders often bear historical wounds, but rather than ensuring free and open discussion, the knee jerk response to censor seldom supports historical or transitional justice".
Speaking to ''
Vox'',
UC Berkeley professor Peter Zinoman said, "To the Chinese, the nine-dash line signifies their legitimate claims to the South China Sea," and "To the Vietnamese, it symbolizes a brazen act of imperialist bullying that elevates Chinese national interest over an older shared set of interests of socialist brotherhood."
See also
*
Baselines of the Chinese territorial sea
*
Foreign policy of China
*
List of irredentist claims or disputes
*
Territorial disputes in the South China Sea
Notes
References
External links
* - the published presentation notes, including supportive illustrations and footnotes for a presentation at the Philippine Institute for Marine and Ocean Affairs of the
López Museum and Libraryevent release
{{Portalbar, Geography, Politics
Territorial disputes of the Philippines
Territorial disputes of China
Territorial disputes of Malaysia
Territorial disputes of Vietnam
Territorial disputes of the Republic of China
South China Sea
Disputed territories in Southeast Asia
Neocolonialism
Chinese irredentism
Territorial disputes of Brunei
Incidents in the South China Sea