With a diameter of approximately 35 km, the Erongo is one of the largest Cretaceous granitic complexes in northwestern Namibia. Situated some 25 km southwest of Omaruru, it rises more than 1000 m above the deeply weathered, 650 to 600 million year old Damara metasediments and granites, which it intruded. In the east, south and west, it is bounded by high granite cliffs, while in the southeast the Erongo volcanic rocks are juxtaposed against conglomerates, sandstones and siltstones of the Triassic Lion’s Head Formation (~220 m. y.), which equally form an imposing natural bastion. The Erongo Mountains represent the eroded core of an ancient volcano, with peripheral and central granite intrusions.