The stone well in the Teshkli-Koba Cave, or Hole Cave, is the biggest attraction of the Tash-Dzhargan area. It is 12 m deep. There are several version of how the stone well was created: by air, water, drying out, weathering or because of the sea that stormed there once. The place is located in the Simferopol District, about 1.5 km to the east of Chistenkoye village. It is very popular with mountaineers.