Geological period: Upper Imbrian (From -3.8 billions years to -3.2 billions years)
Dimension: 411x411Km / 242x157Mi
Height/Wide ratio: Unknown height. Impossible calculation.
Very large crater shaped formation of 237 000 km2. Steep slopes constituted by North slopes of Montes Jura. Walls constituted by Montes Jura gobbled to the South in the lava of Mare Imbrium. Flat floor filled with lava and situated 600 m lower than Mare Imbrium.
Interest: Exceptional formation
Observation period: 3 days after First Quarter or 2 days after Last Quarter
Minimal Instrument: 10x binoculars
Longitude: 32.0° West
Latitude: 45.0° North
Area: North-West part of Mare Imbrium