Image credit: NASA/JPL-Caltech/Univ. of Arizona
This image from NASA's Mars Reconnaissance Orbiter (MRO) shows an impact crater looking amusingly like a tadpole because of the valley that was carved by water that used to fill it.
It is often difficult to differentiate between inlet and outlet channels, but water always flows downhill. In this particular case, we can infer that water is flowing outward because we have the necessary terrain-height information.
Source / Image Courtesy
Last edited by Dragon on 07/02/18, 09:33 pm; edited 1 time in total