Origin of Dao Vallis
Dao Vallis begins near a large volcano, called Hadriaca Patera, so it is thought to have received water when hot magma melted huge amounts of ice in the frozen ground. The partially circular depressions on the left side of the channel in the image below suggests that groundwater sapping also contributed water.
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Hellas quadrangle map showing Dao Vallis in the upper middle of the map.
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Dao Vallis, as seen by THEMIS. Click on image to see relationship of Dao Vallis to other nearby features.
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