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Maumee Valles is an ancient river valley in the Lunae Palus quadrangle of Mars, located at 19.7° N and 53.2° W. It is 350.0 km long and was named after a North American river in Indiana and Ohio.
Together with other ancient river valleys, it has provided strong evidence for a great deal of running water on the surface of Mars.
References
Maumee Valles Wikipedia(Text) CC BY-SA