The Tiu Valles /ˈtiːuː ˈvæliːz/ are an outflow channel system in the Oxia Palus quadrangle of Mars, centered at 16.23° North and 34.86° West.

[1] They are 1,720 km (1,070 mi) long and were named after the word for "Mars" in Old English (West Germanic).

[1]

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