Mancos River, San Juan River confluence (Four Corners)
(Carrizo Mountains at southwest)
|Origin||Confluence of West Mancos River and East Mancos River
|Mouth||Confluence with San Juan
|Mouth elevation||4,639 ft (1,414 m)|
The Mancos River is an 85.4-mile-long (137.4 km) northeast tributary of the San Juan River. It flows from the confluence of West Mancos River and East Mancos River near Mancos, Colorado and joins the San Juan near Four Corners Monument in New Mexico.