The Oyster River is a tributary of the Saint George River in Knox County, Maine.

From its source (44°11′29″N 69°09′42″W / 44.1914°N 69.1617°W / 44.1914; -69.1617 (Oyster River source)) in Rockport, the river runs 12.5 miles (20.1 km)[1] south and southwest to its confluence with the Saint George.

Its lower third forms the border between Warren and Thomaston.

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