Summit calderas are 60 x 80 km wide, up to 3.2 km deep;[20] scarp around margin is up to 8 km high.[22] Ascraeus Mons 14.9 km (9.3 mi)[19] 0.44 volcanic Tallest of the three Tharsis Montes Elysium Mons 12.6 km (7.8 mi)[19] 0.37 volcanic Highest volcano in Elysium Arsia Mons 11.7 km (7.3 mi)[19] 0.35 volcanic Summit caldera is 108 to 138 km (67 to 86 mi) across[19] Pavonis Mons 8.4 km (5.2 mi)[19] 0.25 volcanic Summit caldera is 4.8 km (3.0 mi) deep[19] Anseris Mons 6.2 km (3.9 mi)[23] 0.18 impact Among the highest nonvolcanic peaks on Mars, formed by the Hellas impact Aeolis Mons ("Mount Sharp") 4.5 to 5.5 km (2.8 to 3.4 mi)[24][n 7] 0.16 deposition and erosion[n 8] Formed from deposits in Gale crater;[29] the MSL rover has been ascending it since November 2014.[30] Vesta Rheasilvia central peak 22 km (14 mi)[n 9][31][32] 8.4 impact Almost 200 km (120 mi) wide.