Orog Lake, or Orog Nuur (Mongolian: Орог нуур) is a lake located in the district of Bogd, in Bayankhongor Province, Mongolia.
| Orog Lake | |
|---|---|
 View of lake taken during ISS Expedition 16 | |
  Orog Lake | |
| Location | Bayankhongor Province |
| Coordinates | 45°03′18″N 100°42′17″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) |
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]
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