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Last updated on April 20, 2014 at 19:30 EDT
Neighboring Volcanoes
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Neighboring Volcanoes

April 12, 2011
Ceraunius Tholus and Uranius Tholus are two volcanoes in the Tharsis region of Mars. Ceraunius Tholus is 130 km across and rises 5.5 km above its surroundings. The flanks of this volcano are etched with many valleys. Its neighbour, Uranius Tholus is a smaller volcano, with a base diameter of 62 km and a height of 4.5 km.