Yukari Kisla Cave

Yukarı Kışla Cave (Turkish: Yukarı Kışla Mağarası) is located in the Şile district of İstanbul Province. The cave is 40 m long and 3 m deep. 

Coordinates: 41° 3' 38.25" N  29° 45' 15.18" E

Photo by AKKUYRUK