The Gulf of Riga, Bay of Riga, or Gulf of Livonia (, , ) is a bay of the

Baltic Sea The Baltic Sea is an arm of the Atlantic Ocean that is enclosed by the countries of Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Poland, Russia, Sweden, and the North European Plain, North and Central European Plain regions. It is the ...

between

Latvia Latvia, officially the Republic of Latvia, is a country in the Baltic region of Northern Europe. It is one of the three Baltic states, along with Estonia to the north and Lithuania to the south. It borders Russia to the east and Belarus to t ...

and

Estonia Estonia, officially the Republic of Estonia, is a country in Northern Europe. It is bordered to the north by the Gulf of Finland across from Finland, to the west by the Baltic Sea across from Sweden, to the south by Latvia, and to the east by Ru ...

. The island of

Saaremaa Saaremaa (; ) is the largest and most populous island in Estonia. Measuring , its population is 31,435 (as of January 2020). The main island of the West Estonian archipelago (Moonsund archipelago), it is located in the Baltic Sea, south of Hi ...

(Estonia) partially separates it from the rest of the Baltic Sea. The main connection between the gulf and the Baltic Sea is the

Irbe Strait Irbe Strait, also known as Irben Strait (, , ), forms the main exit out of the Gulf of Riga to the Baltic Sea, between the Sõrve Peninsula forming the southern end of the island Saaremaa in Estonia and Courland Peninsula in Latvia. It is wide ...

. The Gulf of Riga, as a sub-basin of the Baltic, also includes the

Väinameri Sea The Väinameri (Estonian for ''Strait Sea'' or ''Sea of Straits''; ) or Väinameri Sea is a strait and sub-bay of the Baltic Sea, located between the West Estonian Archipelago and the Estonian mainland, within western Estonia. It is the norther ...

in the

West Estonian archipelago The West Estonian archipelago (, also Moonsund archipelago) is a group of Estonian islands located in the Baltic Sea around Väinameri. The total area is about . The archipelago is composed of the islands Saaremaa, Hiiumaa, Muhu, Vormsi and ab ...

Geography

Extent

The

International Hydrographic Organization The International Hydrographic Organization (IHO) (French: ''Organisation Hydrographique Internationale'') is an intergovernmental organization representing hydrography. the IHO comprised 102 member states. A principal aim of the IHO is to ...

defines the Gulf of Riga's western limit as "A line running from Lyser Ort (57°34'N), in Latvia, to the South extreme of

, through this island to

Pammana Pammana is a village in Saaremaa Parish, Saare County in western Estonia. Before the administrative reform in 2017, the village was in Leisi Parish Leisi Parish was a municipality in Saare County, Estonia. The parish did consist of one small ...

(22°34'E), thence to

Emmaste Emmaste () is a village in Hiiumaa Parish, Hiiu County in northwestern Estonia Estonia, officially the Republic of Estonia, is a country in Northern Europe. It is bordered to the north by the Gulf of Finland across from Finland, to the west ...

Point, the S extreme of

Hiiumaa Hiiumaa ( , ) is the second largest island in Estonia and is part of the West Estonian archipelago, in the Baltic Sea. It has an area of 989 km2 and is 22 km from the Estonian mainland. Its largest town is Kärdla. It is located within ...

, through Hiiumaa to

Tahkuna Tahkuna is a village in Hiiumaa Parish, Hiiu County in northwestern Estonia Estonia, officially the Republic of Estonia, is a country in Northern Europe. It is bordered to the north by the Gulf of Finland across from Finland, to the west by t ...

Point, the North extreme thereof, and on to Spithamn Point in Estonia".

Islands

Major islands in the gulf include

Kihnu Kihnu is an island in the Baltic Sea. With an area of , it is the largest island in the Gulf of Riga and the seventh largest island of Estonia. With a length of and width of , the island's highest point is above sea level. Kihnu belongs to P ...

, and

Ruhnu Ruhnu (; ; ) is an Estonian island in the Gulf of Riga in the Baltic Sea. Its territory of is administratively part of Saare County, Saare ''maakond'' (county). Ruhnu lies geographically closer to the coast of Courland on the mainland of Latvia ...

, which are all in

Estonian Estonian may refer to: * Something of, from, or related to Estonia, a country in the Baltic region in northern Europe * Estonians, people from Estonia, or of Estonian descent * Estonian language * Estonian cuisine * Estonian culture See also

...

territory. Kihnu covers an area of . Saaremaa island is responsible for the brackish water of the Gulf of Riga, as it is partially "shielded" from the Baltic Sea. The Baltic itself is already less salty than the global oceanic average, but this effect has a north–south and east–west gradient.

Cities

Notable cities around the gulf include

Riga Riga ( ) is the capital, Primate city, primate, and List of cities and towns in Latvia, largest city of Latvia. Home to 591,882 inhabitants (as of 2025), the city accounts for a third of Latvia's total population. The population of Riga Planni ...

and

Jūrmala Jūrmala (; "seaside") is a state city in the Vidzeme region of Latvia, about west of Riga. Jūrmala is a resort town stretching and is sandwiched between the Gulf of Riga and the Lielupe River. It has a stretch of white-sand beach and is the ...

in Latvia, and

Pärnu Pärnu () is the fourth-largest city in Estonia. Situated in southwest Estonia, Pärnu is located south of the Estonian capital, Tallinn, and west of Estonia's second-largest city, Tartu. The city sits off the coast of Pärnu Bay, an inlet of ...

and

Kuressaare Kuressaare () is a populated places in Estonia, town on the island of Saaremaa in Estonia. It is the administrative centre of Saaremaa Municipality and the seat of Saare County. Kuressaare is the westernmost town in Estonia. The recorded popul ...

in Estonia. The main rivers flowing into the gulf are

Daugava The Daugava ( ), also known as the Western Dvina or the Väina River, is a large river rising in the Valdai Hills of Russia that flows through Belarus and Latvia into the Gulf of Riga of the Baltic Sea. The Daugava rises close to the source of ...

Lielupe The Lielupe ( in Latvian language, Latvian Literal translation, literally: ''Large River'', , ) is a river in central Latvia. Its length is (the length would reach if the Mēmele River were counted as part of the Lielupe). The surface area of ...

Gauja The Gauja River (, ) is a river in the Vidzeme region of Latvia. It is the only large river of Latvia that begins and ends its flow in Latvia. Its length is 460 km, of which 93.5 km (approximately one-fifth) are in Gauja National P ...

, and

Salaca The Salaca () is a river in northern Latvia. It flows from Lake Burtnieks in Vidzeme, 90 km, to the Gulf of Riga. The river flows through three towns, Mazsalaca, Staicele and Salacgrīva. The riverbanks feature Devonian red sandstone cli ...

Salinity

The freshwater runoff entering the Baltic sea accounts for two percent of its volume. A narrow connection to the North Sea means that water stays in the Baltic for an average of 30 years. These two characteristics work to make the Baltic Sea one of the largest

brackish Brackish water, sometimes termed brack water, is water occurring in a natural environment that has more salinity than freshwater, but not as much as seawater. It may result from mixing seawater (salt water) and fresh water together, as in estuari ...

bodies of water in the world. The Gulf of Riga has an average salt concentration for the Baltic Sea, which is around six to ten parts per thousand. Freshwater has a concentration of 0.5 parts per thousand, and seawater is about 30 parts per thousand.C.Michael Hogan. 2011. ''Gulf of Riga''. Encyclopedia of Earth. Eds. P.Saundry & C.J.Cleveland. National Council for Science and the Environment. Washington DC.

Winter

In winter, most or all of the Bay occasionally freezes. This is due to low salinity and the calming effect of the partial closure of the entrance of the gulf. During the winter, many people walk over the bay. The thickest recorded ice was thick in the winter of 1941–42. Ice hole fishing has been a traditional source of winter food, and remains a common activity. The ice usually melts between March and April. In late March 2013, when the ice started to melt, 200 people had to be rescued from ice floes.