Tianjun County, alternately romanized from Tibetan as Themchen, is a county of Qinghai Province, China, bordering Gansu Province to the north. It is under the administration of the Haixi Mongol and Tibetan Autonomous Prefecture. The county seat in Xinyuan Town.

Administrative divisions Tianjun County is divided into 3 towns and 7 townships.

Name Simplified Chinese Hanyu Pinyin Tibetan Wylie Mongolian (traditional script) Mongolian (Cyrillic) Administrative division codeTowns Xinyuan Town(Xêyoin) 632823100 Muri Town(Muli, Mêri) 632823101 Jianghe Town(Jongqu) 632823102Townships Karmar Township(Kuai'erma) 632823200 Zhugkyung Township(Zhouqun) 632823201 Chagmar Township(Zhihema) 632823202 Sur Township(Suru, Suli) 632823203 Sênggê Township(Sengge, Shengge) 632823204 Yangkêng Township(Yangkang) 632823205 Lungmar Township(Longmen) 632823206

Climate Tianjun County has a dry-winter subalpine climate (Köppen Dwc), in common with many parts of the Tibetan Plateau. It features pleasant, rainy summers with chilly mornings, and frigid, clear, extremely dry winters with large diurnal temperature swings.

Economy The county is served by the Qinghai–Tibet Railway; its Tianjun railway station is located near the county seat, Xinyuan Town.

Large coalfields are worked near Muli Town in the northern part of the county, at the elevation around 4,000 m above the sea level.The Muli Coal Mine of Qinghai Kingho Group The Muli coal fields are connected with the Ha'ergai railway station on the Qinghai–Tibet Railway by a long branch railway, whose two sections are known as the Tsaidar Railway () and the Tsaidar-Muli Railway ().

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