The Fenghuoshan Tunnel () is the highest railway

tunnel A tunnel is an underground or undersea passageway. It is dug through surrounding soil, earth or rock, or laid under water, and is usually completely enclosed except for the two portals common at each end, though there may be access and ve ...

in the world. It is 1,338 metres (4,390 feet) long, and stands 4,905 meters (16,093 feet)

above sea level Height above mean sea level is a measure of a location's vertical distance (height, elevation or altitude) in reference to a vertical datum based on a historic mean sea level. In geodesy, it is formalized as orthometric height. The zero level ...

. It is part of the Qinghai–Tibet Railway, linking

Qinghai Qinghai is an inland Provinces of China, province in Northwestern China. It is the largest provinces of China, province of China (excluding autonomous regions) by area and has the third smallest population. Its capital and largest city is Xin ...

and

Tibet Tibet (; ''Böd''; ), or Greater Tibet, is a region in the western part of East Asia, covering much of the Tibetan Plateau and spanning about . It is the homeland of the Tibetan people. Also resident on the plateau are other ethnic groups s ...

that was completed in 2006. The tunnel is located in the western, sparsely populated

Zadoi County Zadoi County (; zh, s=杂多县) is a county in the southwest of Qinghai Province, China, bordering the Tibet Autonomous Region The Tibet Autonomous Region (TAR), often shortened to Tibet in English or Xizang in Pinyin, Hanyu Pinyin, is a ...

(the eastern edge of the

Hoh Xil Hoh Xil or Kekexili ( Mongolian for "Blue Ridge", also Aqênganggyai for "Lord of Ten Thousand Mountains"), is an isolated region in the northeastern part of Qinghai-Tibet Plateau. On July 7, 2017, the Hoh Xil in Qinghai was listed among the U ...

mountainous region between the

Kunlun The Kunlun Mountains constitute one of the longest mountain chains in Asia, extending for more than . In the broadest sense, the chain forms the northern edge of the Tibetan Plateau south of the Tarim Basin. Located in Western China, the Kunlu ...

and

Tanggula The Tanggula (Chinese: , p ''Tánggǔlāshān'', or , p ''Tánggǔlāshānmài''), Tangla, Tanglha, or Dangla Mountains ( Tibetan: , w ''Gdang La'', z ''Dang La'') is a mountain range in the central part of the Q ...

mountain ranges).

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* Railway tunnels in Qinghai Articles containing video clips {{PRChina-struct-stub

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Further reading

External links