Sof Omar, a tiny Muslim village in Bale (south east of Ethiopia), is the site of an amazing complex of natural caves, cut by the Weyb River as it found its way from the nearby mountains. The settlement, which is a religious site, is named after a local Sheikh. Armed with torches and an official map, visitors to Sof Omar Cave make their way underground, far into the bowels of the earth, beside a subterranean stream, and there can see an extraordinary number of arched portals, high eroded ceilings and deep echoing chambers.