Haidong is a prefecture-level city of Qinghai province in Western China. Its name literally means "east of the (Qinghai) Lake." On 8 February 2013 Haidong was upgraded from a prefecture (海东地区) into a prefecture-level city. Haidong is the third most populous administrative division in Qinghai after Xining and Golmud.

Qinghai is an inland province in Northwestern China. It is the largest province of China by area and has the third smallest population. Its capital and largest city is Xining.