page_title: Multi-ringed basin
hierarchical_section_title: Multi-ringed basin
caption_attribution_description: English: Callisto, composed of rock and ice, is covered with numerous impact craters. The largest of these is Valhalla Basin, a 2748-km (1650-mi) multi-ring impact basin near the top of the image. Craters on Callisto appear as bright and dark spots whose morphology changes. Newer craters appear as sharply defined bright and dark spots. Over time older craters appear as more diffuse splotches.
context_page_description: A multi-ringed basin is not a simple bowl-shaped crater, or a peak ring crater, but one containing multiple concentric topographic rings; a multi-ringed basin could be described as a massive impact crater, surrounded by circular chains of mountains. As such, a multi-ring basin slightly resembles a bull's-eye, may have an area of many thousands of square kilometres.
  An impact crater of diameter bigger than about 180 miles is referred to as a basin.
context_section_description: A multi-ringed basin (also a multi-ring impact basin) is not a simple bowl-shaped crater, or a peak ring crater, but one containing multiple concentric topographic rings; a multi-ringed basin could be described as a massive impact crater, surrounded by circular chains of mountains. As such, a multi-ring basin slightly resembles a bull's-eye, may have an area of many thousands of square kilometres.
  An impact crater of diameter bigger than about 180 miles (290 km) is referred to as a basin.
caption: Valhalla Basin on Jupiter's moon Callisto, taken by Voyager 1
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