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. The sinkhole was formed by a collapse of the surface layer due to dissolution of the underlying limestone.[However, locals believe that it was created by a meteorite, ‘Hawaiyat Najm', which translates to ‘The Falling Star' in Arabic, and hence the name.
To preserve the sinkhole, the local municipality developed a park, Hawiyat Najm Park (Haweat Najm Park), around it, along with a stairway leading down to the lake.