Yana da dama ridges da kwaruruka da kuma yawan tasiri craters na game da 20 km (12 mi) diamita ne bayyane, amma shi ne kasa cratered fiye da nan kusa Pandora, Epimetheus, da kuma Janus. Daga da sosai low yawa da kuma gwada high albedo, shi ne wata ila cewa Prometheus ne mai porous kankara jiki. Akwai mai yawa rashin tabbas a cikin wadannan dabi'u, duk da haka, kuma don haka wannan ya kasance da za a tabbatar. Tambaya: Ta yaya aka Prometheus musamman elongated?
136 kilomita × 79 kilomita × 59 kilomita (85 mi × 49 mi × 37 mi).