Halh River is a river

River

A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

 in eastern Mongolia

Mongolia

Mongolia is a landlocked country in East and Central Asia. It is bordered by Russia to the north and China to the south, east and west. Although Mongolia does not share a border with Kazakhstan, its western-most point is only from Kazakhstan's eastern tip. Ulan Bator, the capital and largest...

 and Inner Mongolia

Inner Mongolia

Inner Mongolia is an autonomous region of the People's Republic of China, located in the northern region of the country. Inner Mongolia shares an international border with the countries of Mongolia and the Russian Federation...

 in northern China

China

Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...

.

The river's source is in the Greater Khingan

Greater Khingan

The Greater Khingan Range , also called the Greater Hing'an Range or Greater Hinggan Range, is a volcanic mountain range in the northeastern part of the People's Republic of China. The range extends roughly 1,200 km from north to south, narrowing towards the south...

 mountains of Inner Mongolia. By the mouth it splits into two distributaries. The left one (Halh River proper) feeds the Buir Lake and next via this lake continues as Orchun Gol. The right one Shariljiin Gol runs directly into the Orchun Gol.

In April–September 1939, the river was the site of the Battles of Khalkhin Gol, one of the Soviet-Japanese border conflicts

Soviet-Japanese Border Wars

The Soviet–Japanese Border Wars were a series of border conflicts between the Soviet Union and Japan between 1932 and 1939.Before Japanese occupation of Manchukuo, the Soviet Union had conflict with China on the border of Manchuria...

. Soviet and Mongolian forces defeated the Japan

Japan

Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

ese Kwantung Army.