Albedo Feature Catena (Crater Chain) Crater Dorsa (Network or group of Wrinkle Ridges) Dorsum (Wrinkle Ridge) Fossa Lacus (Lake) Landing Sites Landing Site Features Mare (Sea) Mons (Mountain) Montes (Mountain Range or group of Mountains) Oceanus (Ocean) Palus (Marsh) Planita (Plains) Promontorium (Promontory) Rima (Rille) Rupes (Scarp) Sinus (Bay) Vallis (Valley)