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. Latin is the language originally spoken in the region around Rome called Latium. ... Crust composition Oxygen 43% Silicon 21% Aluminium 10% Calcium 9% Iron 9% Magnesium 5% Titanium 2% Nickel 0. ... The Sea of Tranquility of the Moon. ... See Cartesian coordinate system or Coordinates (elementary mathematics) for a more elementary introduction to this topic. ...
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. The albedo is a measure of reflectivity of a surface or body. ... The Lunar maria (singular: mare, pronounced MAH-ray) are large, dark, basaltic plains on Earths Moon, formed by ancient basaltic flood eruptions caused by extremely large meteoroid impacts. ... There is more than one crater named Lyell: Lyell (Lunar crater) Lyell (crater on Mars) This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... Crile is a tiny lunar crater. ...
PalusSomni is a curious cross between lunar maria and lunar highlands.
PalusSomni -- the Marsh of Sleep -- was a light grey ovalish region in between the darker Mare Crisium and Mare Tranquillitatus.
PalusSomni and Proclus are a truly odd feature; Alter thinks the marsh subsided subsequent to the impact, and that makes sense, but why "sinking" would make it darker is unclear, unless this were from some baking process (or other factor I'm not up on; Alter often does not explain himself...)
PalusSomni, on the northeastern rim of the mare, is filled with the basalt that spilled over from Tranquillitatis.
The narrow "Bay of Harmony" lies along the eastern edge of the Mare Tranquillitatis.
Along its northern border is an area called the PalusSomni, while the southern border is an area of irregular terrain that contains the ruined Da Vinci crater.
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