Sof Omar is a spectacular underground limestone cave system located in the Bale Zone of southeastern Ethiopia, carved over millions of years by the Web River. As the longest cave in the country, it is a geological masterpiece featuring the breathtaking "Chamber of Columns," where massive stone pillars support high, vaulted ceilings. Beyond its natural beauty, the site holds deep spiritual significance as a sacred place of worship named after the 12th-century Muslim leader Sheikh Sof Omar, and it continues to draw thousands of pilgrims and explorers who come to witness its unique blend of religious history and subterranean wonder.