The Machias River is a major tributary of the Aroostook River, flowing U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map , accessed June 22, 2011 through Aroostook County in the northern part of the state of Maine, USA. From the outflow of Big Machias Lake () in Maine Township 12, Range 8, WELS, the river runs southeast and east to its confluence with the Aroostook in Ashland.
See also List of Maine rivers
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