Copernicus is a relatively young and isolated crater formation with a diameter of 56 miles. With steep crater walls of 11,400 ft it is the most dominant feature in Mare Insularum.
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Copernicus has three central mountains 3,600 ft high. To the upper left is Reinhold (29mi) with its more shallow companion, Reinhold B (15mi). Towards the bottom right of the image is 35-milem Eratosthenes which is touching the southern-most tip of the Apennine mountains (not seen here).