Well-preserved large craters like Tycho (about 53 miles [85 kilometers] across), Copernicus (58 miles [93km] wide), and Aristarchus (25 miles [41km] in diameter) have rim-to-floor depths of about 15,700 feet (4,800 meters), 12,500 feet (3,800m), and 9,800 (3,000m), respectively. These large so-called “complex” craters are surprisingly shallow features. Their depths are only a small fraction, about 1/15 to 1/25, of their diameters. So these “deep pits” are actually shallower than dinner plates. In contrast, fresh craters smaller than about 9 to 12.5 miles (15 to 20km) in diameter have much higher depth-to-diameter ratios. Astronomy magazine subscribers can read the full answer for free. Just make sure you're registered with the website.