The Echo Caves in Limpopo, South Africa, are set in Precambrian dolomite rock, which was first laid down about 3800 million years ago, when Africa was still part of Gondwana. The caves are considered some of the oldest in the world. The Echo Caves are about 92 km north of the similar Sudwala Caves.
There are a number of speleothem structures in the cave; two of these are hollow stalactites which when hammered create echoes audible throughout and even outside the caves, thus the name of the caves.