The river rises from a swamp south of Rockville Road (CT 138) in Voluntown.

The river then flows due south to Green Fall Pond (41°31′52″N 71°48′32″W / 41.531°N 71.809°W / 41.531; -71.809), then continues south through North Stonington and into Hopkinton, Rhode Island where the river converges with Parmenter Brook to form the Ashaway River.

In addition to many unnamed tributaries, the following brooks also feed the Green Fall:

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