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Orog Lake
Orog Lake
	View of lake taken during ISS Expedition 16
	Orog Lake
Location	Bayankhongor Province
Coordinates	45°03′18″N 100°42′17″E / 45.05500°N 100.70472°E
Basin countries	Mongolia
Max. length	31.8 km (19.8 mi)
Max. width	7.7 km (4.8 mi)
Surface area	140 km2 (54 sq mi)
Average depth	3 m (9.8 ft)
Max. depth	5 m (16 ft)
Water volume	0.420 km3 (340,000 acre⋅ft)
Surface elevation	1,217 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.

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[1] "Орог-Нур" (in Russian). Большая Советская Энциклопедия. Retrieved 2011-08-27.

[2] 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.

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