THEMIS daytime IR mosaic of Hadriacus Mons. The caldera, with gullies radiating from it, is just to the upper right of center; the outflow channels Dao Vallis and Niger Vallis merge near the bottom.
Hadriacus Mons is an ancient, low-relief volcanic mountain on the planet Mars, located in the southern hemisphere just northeast of the impact basin Hellas and southwest of the similar volcano Tyrrhenus Mons. It has a diameter of 450 kilometres (280 mi). The name was approved in 2007. The flanks of Hadriacus Mons have been eroded into gullies; its southern slopes are incised by the outflow channel Dao Vallis.
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