Tuanjie Lake at the southern edge of the Qaidam
subbasin in the eastern
Qarhan Playa at an elevation of above
sea level. It has an area of . It lies southeast of
Dabusun Lake, south of
Xiezuo Lake, and west of
South Hulsan Lake and is fed by the intermittent stream of the
Shougong River Shōugōng Hé). Its depth usually does not exceed . Tuanjie's position at the south end of the playa means that its waters are relatively less influenced by the concentrated
mineral springs along the playa's northern boundary. Nonetheless, the lake's brine is at or near
saturation with
calcite,
halite,
polyhalite,
kieserite, and (importantly)
carnallite, which is processed to produce
potash for
potassium-rich
fertilizers and other uses. == See also ==