page_title: Equatorial ridge
hierarchical_section_title: Equatorial ridge
caption_attribution_description: English: Mosaic of Iapetus images taken by the Cassini spacecraft, Dec. 31, 2004. Photomosaic assembled by Matt McIrvin.
context_page_description: Equatorial ridges are a feature of at least three of Saturn's moons: the large moon Iapetus and the tiny moons Atlas and Pan. They are ridges that closely follow the moons' equators. They appear to be unique to the Saturnian system, but it is uncertain whether the occurrences are related or a coincidence. All three were discovered by the Cassini probe in 2005. Daphnis also appears to have such a ridge.
  The ridge on Iapetus is nearly 20 km wide, 13 km high and 1,300 km long. The ridge on Atlas is proportionally even more remarkable given the moon's much smaller size, giving it a disk-like shape. Images of Pan show a structure similar to that of Atlas.
context_section_description: Equatorial ridges are a feature of at least three of Saturn's moons: the large moon Iapetus and the tiny moons Atlas and Pan. They are ridges that closely follow the moons' equators. They appear to be unique to the Saturnian system, but it is uncertain whether the occurrences are related or a coincidence. All three were discovered by the Cassini probe in 2005.  Daphnis also appears to have such a ridge.
  The ridge on Iapetus is nearly 20 km wide, 13 km high and 1,300 km long. The ridge on Atlas is proportionally even more remarkable given the moon's much smaller size, giving it a disk-like shape. Images of Pan show a structure similar to that of Atlas.
caption: The ridge on Iapetus
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