and is the bottom end for many outflow channels from the southern highlands as well as from Valles Marineris and the flanks of the Tharsis bulge. It is one of the lowest regions on Mars (2 to 3 km below the mean surface elevation of Mars), so water would tend to flow into it

The elevation generally goes down from the Tharsis Ridge to Chryse. Kasei Valles, Maja Valles, and Nanedi Vallesappear