Multi-ringed basin

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;[1] a multi-ringed basin could be described as a massive impact crater, surrounded by circular chains of mountains[2] resembling rings on a bull's-eye.

[3] An impact crater of diameter bigger than about 180 miles (290 km) is referred to as a basin.

In contrast, a multi-ringed basin has multiple peak-rings displaying as further concentric circles.

[5][6][7] Multi-ring basins are some of the largest, oldest, rarest and least understood of impact craters.

[10] Chicxulub crater in Mexico has a sufficient area to have been a multi-ringed basin,[12]