在任何固态行星或自然卫星上，环形山——不管是撞击坑还是火山坑或是塌陷坑——的深度都指从局部地形的表面距离坑底的高度，或指从坑的边缘距坑底的高度。

右图显示了一个典型环形山的侧面视图。深度A表示从地形表面至坑底的距离；深度B指环形山边缘的平均高度至坑底的距离。

The depth of any crater in a solid planet or moon - whether it is an impact crater, a volcanic crater, or a subsidence crater - may be measured from the local surface to the bottom of the crater, or from the rim of the crater to the bottom.

The diagram above shows the full (side) view of a typical crater. Depth "A" measures from the surface to the bottom of the crater. Depth "B" measures from the mean height of the rim to the bottom of the crater.