StarCo by Ludo Coppens © 2014-
Select a vallis by clicking on the name. Move the mouse over the full scale image of the larger region to show names of prominent surface features and additional data: depth from rim to crater floor and diameter, taken from the Times Atlas of the Moon (Ed. H.A.G. Lewis, Times Newspapers Ltd., 1969; charts available online at http://www.lpi.usra.edu/resources/mapcatalog/LAC/) and from Virtual Moon Atlas (Christian Legrand & Patrick Chevalley).
A vallis (ENG: valley) is a lunar valley with a variety of possible origins: tectonic (graben) as well as crater-
(At right: Vallis Alpes, taken from orbit; © NASA)