Mommur Chasma (Oberon)

Spirit place, forest home of Oberon in "Midsummer Night's Dream"

Mommur Chasma is the largest 'canyon' on the known part of the surface of Uranus' moon Oberon. The canyon is an example of graben The chasma was first imaged by Voyager 2 spacecraft in January 1986. (wikipedia entry)

A chasma is a deep, elongated, steep-sided depression. On Oberon they are named after shakespearean tragic heroes and places.