Khalkhyn Gol

File:Amur.svg

Khalkyn Gol (Халхин-Гол) in Amur river basin

Khalkhyn Gol (Халхын гол)
Khalkh River, Khalkha River
River
Countries	Mongolia, China
Mongolian Aimag	Dornod
Chinese Region	Inner Mongolia
Chinese Prefecture	Hulunbuir
Source
- elevation	1,443 m (4,734 ft)
- coordinates
Mouth	Buir Lake
- elevation	583.1 m (1,913 ft)
- coordinates
Length	233 km (145 mi)
Basin	17,000 km2 (6,564 sq mi)
Discharge
- average	25 m3/s (883 cu ft/s)

The Khalkh River (also spelled as Khalkha River; Mongolian: Халх гол; Chinese: 哈拉哈河; pinyin: Hālāhā Hé) is a river in eastern Mongolia and northern China's Inner Mongolia region. The river is also referred to with the genitive suffix -iin as the Khalkhyn Gol or River of Khalkh

The river's source is in the Greater Khingan mountains of Inner Mongolia. In its lower course, around , the river splits into two distributaries. The left branch (the Halh River proper) flows into the Buir Lake at ; it then flows from that lake at ) as the Orchun Gol (Chinese: 乌尔逊河; pinyin: Wūěrxùn Hé). The right branch, known as the Shariljiin Gol (Mongolian: Шарилжийн гол) flows directly into the Orchun Gol at .

From May–September 1939, the river was the site of the Battles of Khalkhin Gol, the decisive engagement of the Soviet-Japanese border conflicts. Soviet and Mongolian forces defeated the Japanese Kwantung Army.