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Khalkyn Gol (Халхин-Гол) in Amur river basin
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 48°01′59″N 118°08′03″E / 48.033179°N 118.134290°E, the river splits into two distributaries. The left branch (the Halh River proper) flows into the Buir Lake at 47°53′44″N 117°50′08″E / 47.895556°N 117.835556°E; it then flows from that lake at 47°57′00″N 117°48′51″E / 47.950011°N 117.814270°E) 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 48°04′12″N 117°45′20″E / 48.069891°N 117.755433°E.
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.