Dabusun or Dabuxun Lake, alternately known as Dabasun Nor, is a lake beside the town Qarhan, just north of Golmud in the Haixi Prefecture of Qinghai Province in northwestern China. Fed by the main course of the Golmud River, it is the largest present-day lake in the Qarhan Playa. Like the other lakes of the surrounding Qaidam Basin, it is extremely saline, with 307–338 grams of salt per liter of water (2.5 lb/gallon).

Golmud, also known by various other romanizations, is a county-level city in the Haixi Mongol and Tibetan Autonomous Prefecture of Qinghai Province, China. It is now the second-largest city in Qinghai and the third largest in the Tibetan Plateau. The population in 2020 is 221,863.