Palus Epidemiarum
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Palus Epidemiarum (latin for Marsh of Epidemics) is a small lunar mare in the southwestern part of the Moon's near side. It lies to the southwest of Mare Nubium, and southeast of Mare Humorum. This feature forms a rough band of lava-flooded terrain that runs generally west-east, with a northward extension near the western end.
This mare is notable for a system of rilles in the western end named the Rimae Ramsden, and for the wide Rima Hesiodus that extends from near the mid-point to the east-northeast roughly 300 km. The flooded Capuanus crater is occupies the southern center of the Palus Epidemiarum, and is attached to the southern edge. Near the western end is the flooded Ramsden crater, after which the Rimae Ramsden are named. The Cichus crater forms the eastern end of the mare.
The northern extension of the mare reaches the outer rims of the Campanus-Mercator crater pair. A narrow valley between these craters joins Palus Epidemiarum with Mare Nubium, and a rille from the Rimae Ramsden follows the course of this cleft. The small double-walled Marth crater lies at the southern mid-point of this northern extension.
The selenographic coordinates of this feature are 32.0° S, 28.2° W, and it is enclosed within a diameter of 286 km. Altimetry data from the Clementine spacecraft shows that this feature slopes downward from west to east, with a height difference of 2 km from end to end.
