Perspective view of the Martian polar ice cap and the scarp Rupes Tenuis with Abalos Mensa on the left of the picture. Picture was taken by the Mars Express orbiter of the European Space Agency
Rupes Tenuis (Latin: thin cliff) is a Martian north polar scarp.[1] It is named after one of the classical albedo features on Mars.[2] Its name was officially approved by IAU in 1988. It extends from latitude 74.94°N to 82.2°N and from longitude 242.12°E to 300.77°E (59.23°W – 117.88°W).[2] Its centre is located at latitude 81.6°N longitude 85.47°W.[2] It marks the outer perimeter of Planum Boreum from longitude 242.12°E to 300.77°E, and it is formed by the eastern extension of the Olympia Cavi, a series of local troughs and depressions, which become longer and deeper as they merge to create the Rupes Tenuis scarp formation.[3] The scarp is located to the west of Chasma Boreale, at the base of Planum Boreum,[4] and its height varies from a few hundred metres to a maximum of approximately 1000 metres.[4][5][6]