Cona, also Cuona Lake or Tsonag Lake, is a major lake of northern Tibet Autonomous Region, China. It is located in Amdo County, Nagqu, west of the road between Nagqu Town and Pana Town. The lake is considered holy to the Tibetans especially in the Bon religion, as it is seen as the "soul lake" of the Razheng Living Buddha. The smaller Ganong Lake lies almost adjacent to the southeast.