rima ariadaeus

Running in an almost straight line for 220km, with a nearly uniform width of about 4km, this shallow cleft resembles nothing so much as a canal connecting the Mare Tranquillitatis and the Mare Vaporum.

Photo: Patrice Poyet. The full size original of this can be seen in his large annotated collection of images, Poyet's Celestial HyperBook.

Inconstant Moon