Rim (crater)

The rim or edge of an impact crater is the part that extends above the height of the local surface, usually in a circular or elliptical pattern.

In a more specific sense, the rim may refer to the circular or elliptical edge that represents the uppermost tip of this raised portion.

[1] Large craters are those with a diameter greater than 2.3 km, and are distinguished by central uplifts within the impact zone.

When combined with potential weathering due to atmospheric erosion over time, determining the average height of a crater rim can be somewhat difficult.

[1] Additionally, crater depth and the volume of melt produced in the impact are directly related to the gravitational acceleration between the two bodies.

Crater rim of Meteor Crater , Arizona
The rim of Endurance Crater on Mars , as seen from the landing site of the Opportunity rover .
A side view of a crater, with a raised rim, highlighted in red.