Issuing from small ponds and wetlands on the east side of town, it meanders generally westward through mostly wooded areas before emptying into the Konkapot River near the village of Southfield.
The name of the river was derived from a Native American sachem of the Mohicans, Aaron Umpachene (1676–1751), who lived in Massachusetts in the vicinity of Great Barrington and Sheffield.
[5] Rugged terrain of the Berkshire Plateau characterizes the environs of the Umpachene River, where hills and sheer gorges support a diverse array of plant life throughout woodlands and adjacent wetland areas.
Sand and gravel deposits can be found along the river's course, detritus left behind roughly 13,000 years ago as glaciers retreated northward.
Although most land in the surrounding region is not well-suited to farming, narrow expanses of prime agricultural soil can be found in areas adjacent to the Umpachene River.