Genuine hiking experience in Dhofar Mountains. You will explore one of the largest sinkholes in the world and descend to a huge cave located in the steep walls of the sinkhole. vantage points. Before reaching the sinkhole you will make stop in Darbat valley where you will be astonished by the green nature, cascades, huge waterfall and also camel herds crossing the azure waters of Darbat river. Then you will proceed higher to the Jabal Qara mountains to reach the impressive, 211 metres deep Tawi Attair (Well of Birds) sinkhole.