Lava flows on the Moon, in western <a href="https://en.wikipedia.org/wiki/Mare_Imbrium" class="extiw" title="en:Mare Imbrium">Mare Imbrium</a> (centered at 27.7° N, 29.5° W). Photo by <a href="https://en.wikipedia.org/wiki/Apollo_15" class="extiw" title="en:Apollo 15">Apollo 15</a>, taken 1 August 1971 from altitude 99 km. Width of the photo is 75 km, north is approximately up.
NASA
part of image <a rel="nofollow" class="external text" href="http://wms.lroc.asu.edu/apollo/view?camera=M&amp;image_name=AS15-M-1558">AS15-M-1558</a> by Apollo 15