Kaf

The Musulmans believed that Kaf was a huge mountain which reached the horizon with its every side. They said that the earth was in the centre of the mountain like a finger in the centre of a ring. The stone Sakhrat lies at the mountain's base, and the smallest piece of it has the power to tell untold marvels. The stone is made from a single emerald and is said to cause earthquakes. Many Eastern tales reference the mountain and it's believed that genii inhabit it. It can only be reached by travelling through dark wildernesses and the traveller must be led by a supernatural being.