Landsat TM image (N up) of the eastern Richtersveld along the border between South Africa and Namibia. The prominent Rooiberg II alkaline ring complex (R) can be seen at the bottom, while a series of overlapping central complexes stretch northwards from Rooiberg (X = Xaminxaip, M = Mt Stewart, K = Klipbokkop, S = Sjambokkloof, crossing the Orange River and disappearing under younger cover (A = Aussenkehr)