Orog Lake

Lake in Bayankhongor Province, Mongolia

45°03′18″N 100°42′17″E / 45.05500°N 100.70472°E / 45.05500; 100.70472Basin countriesMongoliaMax. length31.8 km (19.8 mi)Max. width7.7 km (4.8 mi)Surface area140 km² (54 sq mi)Average depth3 m (9.8 ft)Max. depth5 m (16 ft)Water volume0.420 km³ (340,000 acre⋅ft)Surface elevation1,217 m (3,993 ft)

Orog Lake, or Orog Nuur (Mongolian: Орог нуур) is a lake located in the district of Bogd, in Bayankhongor Province, Mongolia.

It is situated at an altitude of 1216 m above sea level. Fed by the waters of the river Tüyn Gol. The shores are low and sandy, with salt marshes in some places. Fresh or salt water predominates depending on the amount of rainfall. Frozen from November to April. It is rich in fish and waterfowl.^[1]

Uranium and arsenic accumulate in this lake during evaporation, although, under very dry conditions, some As(V) reacts with ferrihydrite and is removed.^[2]

References

^ "Орог-Нур" (in Russian). Большая Советская Энциклопедия. Retrieved 2011-08-27.
^ Gankhurel, B; Fukushi, K; Davaasuren, D; Imai, E (August 15, 2022). "Arsenic and uranium contamination of Orog Lake in the Valley of Gobi Lakes, Mongolia: Field evidence of conservative accumulation of U in an alkaline, closed-basin lake during evaporation". Journal of Hazardous Materials. 436. doi:10.1016/j.jhazmat.2022.129017.