As of 2026-05-01, Utopia Planitia tops the list with 3,560 km.
- #1 Utopia Planitia — 3,560 km
impact basin on Mars
Utopia Planitia is a large plain within Utopia, the largest recognized impact basin on Mars and in the Solar System with an estimated diameter of 3,300 km (2,100 mi). It is the Martian region where the Viking 2 lander touched down and began exploring on September 3, 1976, and the Zhurong rover touched down on May 14, 2021, as a part of the Tianwen-1 mission. It is located at the antipode of Argyre Planitia, centered at 46.7°N 117.5°E. It is also in the Casius quadrangle, Amenthes... Read more on Wikipedia.
Wikidata - #2 Borealis Planitia — 3,450 km
crater on Mercury
Borealis Planitia is a large plain on Mercury with a smooth floor, thought to be similar to a lunar mare. It is centered at 73.4° N, 79.5° W. The name is Latin for Northern Plain. Read more on Wikipedia.
Wikidata - #3 South Pole–Aitken basin — 2,500 km
very large impact crater on the southern far side of the Moon
The South Pole–Aitken basin is an immense impact crater on the far side of the Moon. At roughly 2,500 km (1,600 mi) in diameter and between 6.2 and 8.2 km (3.9–5.1 mi) deep, it is one of the largest known impact craters in the Solar System. It is the largest, oldest, and deepest basin recognized on the Moon. It is estimated that it was formed approximately 4.2 to 4.3 billion years ago, during the Pre-Nectarian epoch. It was named for two features on opposite sides of the basin: the... Read more on Wikipedia.
Wikidata - #4 Skinakas — 2,300 km
structure on Mercury
The Skinakas basin is the informal name given to a structure on Mercury that appeared to be an extremely large impact basin. The limited-resolution Mariner 10 images available showed a double-ringed structure, with the inner ring having a diameter of around 1600 km, which would have made it one of the largest impact basins in the Solar System. It appeared to be even larger than the Caloris basin on Mercury, which has been known since the Mariner 10 flybys of that planet. The part of the outer... Read more on Wikipedia.
Wikidata - #5 Isidis Planitia — 1,225 km
impact crater and plain on Mars
Isidis Planitia is a plain located within a giant impact basin on Mars, located partly in the Syrtis Major quadrangle and partly in the Amenthes quadrangle. At approximately 1,900 km (1,200 mi) in diameter, it is the third-largest confirmed impact structure on the planet, after the Hellas and Utopia basins. Isidis was likely the last major basin to be formed on Mars, having formed approximately 3.9 billion years ago during the Noachian period, by an impactor around 200 kilometres (120 mi) in... Read more on Wikipedia.
Wikidata - #6 Argyre Planitia — 893 km
crater on Mars
Argyre Planitia is a plain located within the impact basin Argyre in the southern highlands of Mars. Its name comes from a map produced by Giovanni Schiaparelli in 1877; it refers to Argyre, a mythical island of silver in Greek mythology. Read more on Wikipedia.
Wikidata - #7 Abisme — 768 km
crater on Iapetus
Abisme /æˈbiːm/ is a large impact basin located in Cassini Regio at 37.5°N, 267.1°E. Craters Climborin, Clarin, Dapamort, Johun and Valdebron can be found inside Abisme. It was imaged for the first time by the Cassini spacecraft in 2004. Read more on Wikipedia.
Wikidata - #8 Rembrandt — 716 km
crater on Mercury
Rembrandt is a large impact crater on Mercury. With a diameter of 716 km it is the second-largest impact basin on the planet, after Caloris, and is one of the larger craters in the Solar System. It was discovered by MESSENGER during its second flyby of Mercury on October 6, 2008. The crater is 3.9 billion years old, and was created during the period of Late Heavy Bombardment. The density and size distribution of impact craters along Rembrandt's rim indicate that it is one of the youngest... Read more on Wikipedia.
Wikidata - #9 Beethoven — 630 km
crater on Mercury
Beethoven is a crater at latitude 20°S, longitude 124°W on Mercury. It is 630 km in diameter and was named after Ludwig van Beethoven. It is the eleventh largest named impact crater in the Solar System and the third largest on Mercury. Read more on Wikipedia.
Wikidata - #10 Turgis — 580 km
largest crater on Saturn's moon Iapetus
Turgis is the largest known crater on Saturn's moon Iapetus. It is 580 km in diameter, 40% of the moon's diameter and one of the larger craters in the Solar System. It is named after a Saracen baron, Turgis of Turtelose (Tortosa). Read more on Wikipedia.
Wikidata