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Vedra Valles is an ancient river valley in the Lunae Palus quadrangle of Mars, located at 19.4° N and 55.6° W. It is 115.0 km long and was named after an ancient river in Great Britain.
Together with other ancient river valleys, it has provided strong evidence for a great deal of running water on the surface of Mars.
References
Vedra Valles Wikipedia(Text) CC BY-SA