Ali Sadr water cave in hamadan iran 

The mountainous position of Hamadan has led to the formation of many wonderful and beautiful caves of which according to specialists the Alisadr is one of the most astonishing. There are few caves like this any where else across the world. Local people sometimes call it Alisadr or Alisad. Located 60 kilometers north of Hamadan, Alisadr is a vast cave that contains a lake and a labyrinth of chambers along which one can sail for tens of kilometres. The clear water of the lake is several meters deep and the cave’s walls, floor and ceiling are covered with an abundance of marvellous stalactites and stalagmites and various natural stones that have taken the shape of various animals, objects and islands. No living creature lives in this cave and in its water because there is no natural light