Athabasca 'Islands'
Floods may have carved teardrop-shaped landforms in Athabasca Vallis in the Cerberus region south of Mars's Elysium volcanoes.
NASA / JPL / MSSS
Features like these occur in central and eastern Washington in the northwestern United States. The Washington examples formed when massive amounts of water rushed across the landscape, scouring a 'channeled scabland' during the last Ice Age roughly 12,000 to 13,000 years ago. The features on Mars are much older. This is a mosaic of six Mars Orbiter Camera images taken from 1999 through 2002. The mosaic covers an area 11.9 kilometers (7.4 miles) by 13.0 km (8.1 mi).
NASA / JPL / Malin Space Science Systems

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