Titan Mithrim Montes ≤ 3.3 km (2.1 mi)[48] 0.13 tectonic[48] May have formed due to global contraction[49] Doom Mons 1.45 km (0.90 mi)[50] 0.056 cryovolcanic[50] Adjacent to Sotra Patera, a 1.7 km (1.1 mi) deep collapse feature[50] Iapetus equatorial ridge 20 km (12 mi) (approx.)[51] 2.7 uncertain[n 13] Individual peaks have not been measured Oberon unnamed ("limb mountain") 11 km (7 mi) (approx.)[44] 1.4 impact (?)