Labou Vallis
Labou Vallis is a valley in the Memnonia quadrangle of Mars, located at 8.7° south latitude and 154.5° west longitude. It is 222 km long and has dark [slope streak]s on its walls. The streaks are generally thought to be the dark material that has been exposed by bright dust moving down a steep slope in an avalanche. Labou is a distributary of the Mangala Vallis, emerging from an opening in a crater wall along the floor of the latter.
Image:Labou Vallis.JPG|thumb|Labou Vallis, as seen by HiRISE. The full size image shows old and new dark slope streaks.