Where are the Sof Omar Caves?

Question

Several caves in Spain are sites of prehistoric rock paintings. Approximately when were the earliest, line motifs and stencilled hands, believed to have been painted?

Answer 1

Ethiopia
Holqa Sof Omar is one of the most spectacular and extensive underground caverns in the world. It is over 15 km (9.3 mi) long. UNESCO: The Sof Omar Cave System "represents exceptional geological processes, karstic limestone landforms, and physiographic features ... demonstrating an evolutionary history of millions of years."