Cassini Regio

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What Wikipedia says

Cassini Regio (adjective Cassinian ) is the enigmatic dark area that covers the leading half of Saturn's moon Iapetus. It is named after Giovanni Cassini, the discoverer of Iapetus; 'Regio' is a term used in planetary geology for a large area that is strongly differentiated in colour or albedo from its surroundings.

Excerpt from the Wikipedia article “Cassini Regio”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NASA / JPL / Space Science Institute, Public domain, via Wikimedia Commons.