The Sof Omar cave system, 120 kilometers east of Goba in Bale region, is one of the most spectacular and extensive underground caverns in the world. Formed by the Weyb River as it changed course in the distant past and carved a new channel through limestone foothills, the 16 kilo meters cave system is an extraordinary natural phenomenon of breathtaking beauty.
The dry, cool caves contain many marvels of natural architecture, including soaring pillars of stone 20 meters high, flying buttresses, fluted archways and tall airy vaults. Finally the river itself is reached, flowing through a deep gorge. You can explore the caves on foot, without special climbing equipment, but proper precautions have to be taken. Torches or other lighting are needed and another must is a map. The most direct route through the first part of the caves takes about an hour.
The large central hall of Sof Omar, the 'Chamber of Columns' - so named after the colossal limestone pillars that are it's dominant feature - is one of the highlights of the cave system.
In addition Achere and Aynage, the second and third longest caves in the country, are beautiful underground caverns worth to be visited. It is located in western Hararge province 26 km southeast of Mechara town, Omo tour and car rental can organize caving tour to these destinations .But if you want to do it by your own, necessary precautions needs to be taken (Caving equipments and local guides) before one jumps in to the caves.