Technically, I entered Mawrth Vallis yesterday. But I only knew that by looking at a map. The entrance to the valley is wide enough that I couldn’t see the canyon walls in either direction. But now I’m definitely in a canyon. And the bottom is nice and flat. Exactly what I was hoping for. It’s amazing; this valley wasn’t made by a river slowly carving it away. It was made by a mega-flood in a single day. It would have been a hell of a thing to see.
