Palus Somnii

The Marsh of Sleep, a small mare region located between Mare Crisium and Mare Tranquillitatis.

Visual Description

Palus Somnii appeared as a small, dark patch of mare material situated between the larger Mare Crisium to the north and Mare Tranquillitatis to the southwest. The feature showed typical mare characteristics with its smooth, dark basaltic surface, though it was notably smaller than the major maria surrounding it. The palus served as a connecting region between the larger mare basins.

Notable Features

• Small mare patch between larger maria
• Smooth, dark basaltic surface
• Located east of Mare Tranquillitatis
• South of Mare Crisium
• Connects major mare regions

Notes

• Name means “Marsh of Sleep”
• Part of the mare system on eastern nearside
• Best observed 3-5 days after new moon
• Coordinates: 14.1°N, 45.0°E
• Visible with binoculars as dark patch