Tawi Ateer

Birds Well


Useful Information

Location: Between Mirbat and Salalah, north of the coast, Qara Mountains, Governorate of Dhofar.
Open: No restrictions.
[2010]
Fee: free.
[2010]
Classification:  Doline or sink
Light: n/a
Dimension: VR=210m, A=680m asl. Entrance: 130x90m.
Guided tours:  
Photography:  
Accessibility:  
Bibliography: Mohamed Alian (2010): The largest sinkhole in Oman, Observer Weekend, Wednesday 21 April 2010.
G. Crouch (2003): Caves of Oman, National Geographic, April 2003 issue.  
S. Hanna M. Al Belushi (1996): Introduction to the Caves of Oman, Sultan Qaboos University, International Printing Press, Ruwi, Sultanate of Oman.
Address:  
As far as we know this information was accurate when it was published (see years in brackets), but may have changed since then.
Please check rates and details directly with the companies in question if you need more recent info.
Last update:$Date: 2015/08/30 21:57:01 $

History

 
1980cave fish discovered by British cavers.
1997explored by Slovenian cave explorers and members of Sultan Qaboos University.
2003featured by National Geographic.

Description

Tawi Ateer is only one possible transliteration of the Arabic word, others are Tawi Atayr, Tawi Atir, Tawi Atair, and Tawi Attair. The Niyabat (administrative unit) Tawi Ateer covers an area with 116 villages. The administrative center is located 900m south of the sinkhole, and is also called Tawi Ateer. There seems to be some confusion which was named after which and what the name means. The standard explanation is, the sinkhole was named Tawi Ateer, which translates Well of the Birds, because of the numerous birds living in the cave walls. It seems undisputed that tawi is the Omani word for well, but ateer is not the word for bird. The water from the well was the basis of a cow herder settlement named Ateer and the well was thus named Tawi Ateer (Weel of Ateer village). The locals actually call it Alsharkh, which literally means fissure. We do not know which version is true.

Tawi Ateer Sinkhole is a 210m deep daylight shaft, the entrance to a vast cave. The opening at the surface is of oval shape, main axis is northeast to southwest, with a length of 130m and a witdh of 90m. At a depth of about 100m the shaft narrows, and is only 60m in diameter and almost circular.

The sinkhole can be found northeast of the Tawi Atayr Administrative centre. It is badly signposted but there is a new parking lot and a new trail with viewing platform. Better views allows a walk around the hole, which takes about 20 minutes. Be carefull at the rim, it is really deep! As far as we know it is possible to climb down halfway into the sinkhole, you can simply walk down the wadi. Where the shaft narrows and the walls become vertical, there is an iron platform which was once used for pumping water. From here its definitely the domain of the cavers.

There is a long wadi, ending at the sinkhole, which actually makes it a river sink. The wadi transports enormous amounts of water into the cave during one of the rare but heavy rains. The entrance is located in the mountains, about 680m asl. The sea is only 10km to the south, so the potential is a cave system of almost 600m vertical range.

Looking at the geography, the cave might either drain directly to the sea with underwater springs or to nearby Wadi Dharbat (also Wadi Dirbat). Here the limestone rich karst water reappears and forms waterfalls, which are actually rimstone pool, formed by the deposition of limestone in form of tufa, building dams.

The whole Qara plateau is karstified, there is a vast system of caves, mostly filled with water. The water level of the ground water is actually very high, only 210m below the surface, which is where caving ends and also limits the depth of this cave. In 1980 a team of British cavers visited the water level at the ground of the shaft. They discovered the  troglobite Garra dunseiri, named after Arthur Dunsire, the collector. The fish is endemic, depigmented, but still has eyes.

Some descriptions on the web explain the formation of the sinkhole with the collapse of a huge cavern or chamber. This is actually very unlikely. Such entrance shafts form from the widening of cracks and clefts in the rock by solution and erosion. Obviously there is an enormous change of temperature between day and night. This continually destroys the rock. If it freezes, the water in the cracks freezes too, expands and destrys the rock. The upper half of the shaft is heavily influenced by surface weathering and the erosion of the wadi. The shaft becomes steep where the influence of the surface ends, and only the solution of water flowing down the walls widens the shaft. So there has never been a big collapse, just a slow, continual process of widening.


See also


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