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(Freely adapted from Wikipedia)
Montes Rook is a ring-shaped mountain range that lies along the western limb of the Moon, crossing over to the far side. It completely encircles the Mare Orientale, and forms part of a massive impact basin feature. This range in turn is encircled by the larger Montes Cordillera, which is separated from the Montes Rook by a rugged, ring-shaped plain. The Montes Rook is actually a double-ring formation, sometimes divided into the outer Rook and the inner Rook. Sections of the gap between these sub-ranges contain long valleys filled in places with basaltic lava, forming small lunar maria. One such section along the northeastern part of the range has been named Lacus Veris.
Montes Cordillera is a mountain range on the Moon. This feature forms the outer wall of peaks that surround the Mare Orientale impact basin, the inner ring being formed by the Montes Rook.
Lacus Veris is a small lunar mare on the Moon. This small, roughly crescent-shaped mare region lies between the ring-shaped Inner and Outer Rook mountains that form part of the Orientale impact basin. It lies in a topographic lowland about 1 km below the surrounding peaks. Based on data collected during the Lunar Orbiter missions and from Earth-based telescopes, the mare includes some material from the surrounding highlands.
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