The headwaters of the Maries arise just to the north and west of Dixon in northern Pulaski County ( ). The stream flows generally north into Maries County passing the communities of Brinktown and Venus. It passes under Missouri Route 42 west of Vienna and on into Osage County to the east of Argyle and Koeltztown. The stream enters a series of entrenched meanders and flows under U. S. Route 63 just southeast of Westphalia. It flows under U. S. Route 50 west of Loose Creek and turns west to its confluence with the Osage River just to the north of the Route 50 - Route 63 junction (Coordinates: ).
The name Maries most likely is a corruption of the French marais, meaning "swamp".
- U.S. Geological Survey Geographic Names Information System: Maries River
- Missouri Atlas & Gazetteer, DeLorme, 1998, First edition, pp. 38 and 46, ISBN 0-89933-224-2
- "Osage County Place Names, 1928–1945". The State Historical Society of Missouri. Archived from the original on June 24, 2016. Retrieved November 26, 2016.
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