Khar Lake (Mongolian: Хар нуур, ᠬᠠᠷ᠎ᠠᠨᠠᠭᠤᠷ; lit. 'Black Lake') is located in the Khovd aimag (province) in western Mongolia's Great Lakes Depression.

It is also known as Ha-la Hu, Hara Nuur, Har Nuur, Khara Nur, Khar Nuur, and Ozero Kara-Nor

It should be distinguished from the similarly named Khar Lake (Zavkhan), another lake further east in Mongolia.

It is part of a group of lakes that were once part of a larger prehistoric lake that disappeared 5,000 years ago as the region became drier.

Some sources are using different Khar Lake statistics values:

• Water level: 1,134.08 m
• Surface area: 565.2 km²
• Average depth: 4.14 m
• Volume: 2.34 km.

Water balance of Khar Lake
(Unit of water balance: mm/year)

Surface input		Surface output		Groundwater inflow- outflow	Retention time, years
Precipitation	Inflow	Evaporation	Outflow
54.0	1,786.9	1,117.8	1,287.9	+564.8	1.7

Khar Lake has a single inflow - Chono Kharaikh Gol river, which creates a river delta.

Khar Lake has a connection to Dörgön Nuur south of it.

• Limnological Catalog of Mongolian Lakes