World Tallest peak(s) Base-to-peak height % of radius[n 2] Origin Notes Mercury Caloris Montes ≤ 3 km (1.9 mi)[1][2] 0.12 impact[3] Formed by the Caloris impact Venus Skadi Mons (Maxwell Montes massif) 6.4 km (4.0 mi)[4] (11 km above mean) 0.11 tectonic[5] Has radar-bright slopes due to metallic Venus snow, possibly lead sulfide[6] Maat Mons 4.9 km (3.0 mi) (approx.)[7] 0.081 volcanic[8] Highest volcano on Venus Earth[n 3] Mauna Kea and Mauna Loa 10.2 km (6.3 mi)[10] 0.16 volcanic Just 4.2 km (2.6 mi) of this is above sea level Haleakala 9.1 km (5.7 mi)[11] 0.14 volcanic Rises 3.1 km above sea level[11] Pico del Teide 7.5 km (4.7 mi)[12] 0.12 volcanic Rises 3.7 km above sea level[12] Denali 5.3 to 5.9 km (3.3 to 3.7 mi)[13] 0.093 tectonic Tallest mountain base-to-peak on land[14][n 4] Mount Everest 3.6 to 4.6 km (2.2 to 2.9 mi)[15] 0.072 tectonic 4.6 km on north face, 3.6 km on south face;[n 5] highest elevation (8.8 km) above sea level (but not among the tallest from base to peak) Moon Mons Huygens 5.5 km (3.4 mi)[16][17] 0.32 impact Formed by the Imbrium impact Mons Hadley 4.5 km (2.8 mi)[16][17] 0.26 impact Formed by the Imbrium impact Mons Rümker 1.1 km (0.68 mi)[18] 0.063 volcanic Largest volcanic construct on the Moon[18] Mars Olympus Mons 21.9 km (14 mi)[n 6][19][20] 0.65 volcanic Rises 26 km above northern plains,[21] 1000 km away.