Palus Somni
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Palus Somni (Latin for "Marsh of Sleep") is an area on the Moon of relatively level but somewhat uneven terrain that lies along the northeastern edge of Mare Tranquillitatis and the Sinus Concordiae. It has selenographic coordinates 14.1° N, 45.0° E, and has a diameter of 143 km.
The surface of this feature has low ridges and patches of level terrain. It has a higher albedo than the lunar mare to the west, and is a shade of gray typical of continental terrain. A few minor craters lie within its borders, with the flooded Lyell crater along the west edge, Crile crater to the east, and Franz crater to the northwest.
