The Qarhan Playa has China's largest reserves of salt, potassium, and magnesium, as well as other valuable minerals. Taken together, the mineral resources in the playa were estimated to be worth over 15 trillion RMB (2002). The area's salt has also trapped valuable hydrocarbons. The Sebei-1 and Sebei-2 fields near Suli Lake are also China's 4th-largest onshore reserves of natural gas and the entire area may have reserves as high as 1 trillion m³ (35 trillion cu. ft.). The larger Sanhu Depression includes East and West Taijinar, which hold China's largest reserves of lithium.