Albor Tholus

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Albor Tholus is an extinct volcano in the area Elysium Planitia on Mars. It lies south the neighbouring volcanos Elysium Mons and Hecates Tholus. Albor Tholus is 4.5 km high and possesses at the base a diameter of 160 km. Its Caldera has a diameter of 30 km and is 3 km deep. Compared with terrestrial volcanos the Caldera is unusually deep. Evaluations by the Mars probe Mars Express found that the volcanos of the Elysium region were active over long periods.