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						 Gölcükkuyusu Düdeni  | 
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						 For cave maps and drawings please click on the picture...  | 
					
						 For photographs please click on the photo...  | 
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							Type: 					 | 
					Cave | |||
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							Altitude: 					 | 
					1221 m | |||
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							Depth: 					 | 
					-13 m | |||
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							Length: 					 | 
					20 m | |||
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							Region: 					 | 
					Marmara | |||
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							Province: 					 | 
					Sakarya | |||
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							District: 					 | 
					Tarakli | |||
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							Village: 					 | 
					Alballar | |||
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| Location: It is located near the Kilavuzlar Plateau in the high mountainous region 20 km north from Tarakli District which is 70 km south of Adapazari. | 
| Structural Properties and formation : It is a vertically developed; sinkhole type; fossil cave. It is situated on a fault in NW-SE direction; on the edge of an uvala in east-west direction. This uvala was separated by rows into dolines. The cave which is similar to a pit at the edge of the old basin of the uvala; and sinkhole type; has a Ğ11 m long steep descent. This chimney type developed descent ends in a hall which is 11x10 m. The basin of this hall is covered with soil; pebbles; and debris. The dripstone formation is almost none. It has no connections with surface and subsurface waters since it is a fossil cave which completed its development cycle. | 
| Research History: It was researched by the Geological Studies Department of MTA General Directorate; and published in 2002. | 
| Findings: | 
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