Mare Crisium

Mare Crisium, or the Sea of Crisium is the only mare not connected by the large mare moon system. The sun beams it's light onto this distinct feature and the many surrounding craters casting shadows.

It's dark floor is surrounded by thousands of meters high mountains rising dramatically steep upwards towering from below. It is the most distinct formation on moon you can see with the naked eye and a must see when observed through a telescope.