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'Mollidgewock Brook' is a 12.6 mile long (20.4 km) stream in northern New Hampshire and western Maine in the United States. It is a tributary of the Androscoggin River, which flows south and east into Maine, joining the Kennebec River near the Atlantic Ocean.
Mollidgewock Brook flows out of ''Mollidgewock Pond'' in the town of Upton, Maine and heads west, quickly entering New Hampshire. The brook flows west and north through swampy areas and past low hills in the township of Cambridge before joining the Androscoggin River in the town of Errol.