The East Branch Oyster River is a tributary of the Oyster River in Knox County, Maine. From its source (44°09′03″N 69°08′29″W / 44.1509°N 69.1414°W / 44.1509; -69.1414 (East Branch Oyster River source)) in Rockland, the stream runs 4.8 miles (7.7 km)[1] southwest to its confluence with the main stem of the Oyster River, on the border between Warren and Thomaston.
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