The Northern Polar region is at the bottom and the dark area center bottom is Mare Acidelium with Sinus Meridian the dark region disappearing on the left. The large dark region in the upper part of the image is Mare Erythraeum. I think that the black dot on the right limb is the top of the volcano Olympus Mons poking through the clouds. (correction it is Ascraeus Mons poking up – thanks to Martin Mobberley for this). Click on the image to see it at full size.