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沱江是长江流域在四川省境内的四大支流之一。沱江流域位于富饶而美丽的四川盆地腹部丘陵区中部。发源于川西北九顶山南麓,绵竹县断岩头大黑湾。源头穿越崇山峻岭,流入成都平原,于金堂县赵镇接纳岷江分水——昆河、青白江及湔江,石亭江等四条上游支流后,穿龙泉山金堂峡,进入流域中下游绵延起伏的低山丘陵区简阳、资阳、资中、内江(县、市)、富顺、泸县,至泸州市注入长江。全长629公里,落差2354米,比降3.74‰,流域面积27860平方公里,约占全省面积5.05％。从源头至金堂赵镇为上游,长127公里,比降25.0‰,称为绵远河。从赵镇起至河口称沱江,长502公里,落差214.1公尺,比降0.43‰。
Tuojiang is one of the four major tributaries of the Yangtze River Basin in Sichuan Province. Tuojiang River Basin is located in the fertile and beautiful belly of the Sichuan Basin hilly central. Originated in the south of Jiudingshan in the northwest of Sichuan, Mianzhu County cut off the first large black bay. Source through the mountains, into the Chengdu Plain, in Jinding County Zhao Town Minjiang River to accept - Kunming, Qingbaijiang and Qijiang River, Shiting River and other four upstream tributaries, wearing Longquan Mountain Jintangxia into the middle and lower reaches of the basin rolling low Mountain Yang Jianyang, Ziyang, capital, Neijiang (counties, cities), Fushun, Lu County, Luzhou into the Yangtze River. The total length of 629 kilometers, a gap of 2354 meters, down 3.74 ‰, the basin area of 27860 square kilometers, accounting for 5.05% of the province area. Zhaojin from the source to the Jintang for the upstream, 127 km long, 25.0 ‰ drop, known as the Mian Yuan River. From Zhaozhen to Hekou said Tuojiang, 502 km long, a drop of 214.1 meters, a drop of 0.43 ‰.