Nice shot Leigh, especially as this side of Mars doesn't have the most contrast-y (that's a word, right
) features. Vallis Marineris is setting on the right-hand side - the little darker patch right of centre. You're looking almost straight down on the Tharsis volcanoes, but they'd be hard to pick up without bright clouds or anything else to highlight them at their noon. The darker stuff at the bottom is probably between about Mare Sirenium and Solis Lacus. Looking forward to it getting bigger!