First, Bimmah Sinkhole is a water-filled depression, structurally a sinkhole, in the limestone of eastern Muscat Governorate in the Sultanate of Oman. A lake of turquoise waters, it is 50 m by 70 m wide and approximately 20 m deep. It is only about 600 m away from the sea. Second, Wadi Dayqah Dam, a dam that has been built in this wadi and is considered the biggest one in Oman. It can store 100 million cubic meters of water and the storage lake covers an area of 350 hectares and extends about 6km from the main body of the dam.