Basho crater on Mercury.  Cropped from Mariner 10 image 0167015.
James Stuby based on NASA image
1974-09-22
Mariner 10 Image Archive, <a rel="nofollow" class="external text" href="http://ser.sese.asu.edu/M10/IMAGE_ARCHIVE/SingleImage.html?image_number=167015">image 167015</a>