Marte Vallis is a valley in the Amazonis quadrangle of Mars, located at 15 North and 176.5 West.

[2] It has been identified as an outflow channel, carved in the geological past by catastrophic release of water from aquifers beneath the Martian surface.

[3] The surface material is thought to have been created out of 'a'ā and pāhoehoe lava flows from the Elysium volcanic province in the west.

[4] Marte Vallis is the site of the first discovery of columnar jointing on Mars.

This article about geology, geography or other features of the planet Mars or its moons is a stub.