Khalkhyn Gol

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Khalkhyn Gol (Халхын гол)
Khalkh River, Khalkha River
Countries Mongolia, China
Mongolian Aimag Dornod
Chinese Region Inner Mongolia
Chinese Prefecture Hulunbuir
 - elevation 1,443 m (4,734 ft)
 - coordinates 47°04′51″N 120°29′16″E / 47.08083°N 120.48778°E / 47.08083; 120.48778
Mouth Buir Lake
 - elevation 583.1 m (1,913 ft)
 - coordinates 47°53′44″N 117°50′08″E / 47.89556°N 117.83556°E / 47.89556; 117.83556Coordinates: 47°53′44″N 117°50′08″E / 47.89556°N 117.83556°E / 47.89556; 117.83556
Length 233 km (145 mi)
Basin 17,000 km2 (6,564 sq mi)
 - 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. 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 (Mongolian: Шарилжийн гол) runs directly into the Orchun Gol.

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.