|530 feet (160 m)|
|Length||33 miles (53 km)|
|Progression||Aroostook — St. John — Bay of Fundy|
The Machias River is a major tributary of the Aroostook River, flowing 33.4 miles (53.8 km) 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.
- "Machias River". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. 30 September 1980. Retrieved 2010-03-09.
|Bay of Fundy|
|Gulf of Maine|