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三川河流域位於黄河流域中游托克托、龍門段的左岸,呂梁山西麓。在山西省軍渡下游15公里处,匯入黄河。全流域大体在北緯37°20′～38°15′,东经110°20′～111°30′之間。西北以漢高山、馬头山与湫水河为界,南以上頂山与屈產河分水,西至黃河左岸,东至吕梁山分水嶺以西,流域面積4,076平方公里。其中土石山林區佔55.62％,黄土邱陵區佔38.6％,河谷川地區佔5.78％。該河自河口至交口鎮为干流段,自交
Sanchuan River Basin is located in the middle reaches of the Yellow River Tuoketuo, Longmen section of the left bank, Luliang Mountain foothills. 15 kilometers downstream of the military crossing in Shanxi Province, remitted to the Yellow River. The whole basin is generally between latitude 37 ° 20 ’~ 38 ° 15’ and longitude 110 ° 20 ’~ 111 ° 30’. The northwest is Han Gao Mountain, Matou Mountain and Huangshui River, bounded by Shangding Mountain and Quy River, southward to the left bank of the Yellow River and west of Lvliangshan watershed, with a basin area of 4,076 square kilometers. Among them, 56.62% of the earth and rock forest area, 38.6% of the loess Qiu Ling area and 5.78% of the valley area. The river from mouth to Jiaokou for the mainstream section of self-self