The early pages of Nepali history are shrouded in myths of hoary past. People still believe that the entire Kathmandu valley the heart of Nepal was a lake. Suddenly some geographical factors played a role that the water got drained off. In puranic lore, this lake has been described as Nagvas or Nagrid and the person responsible according to Buddhist school is one Manju Shree and Sanatani Hindus described him Vishnu and thereafter it became habitable Nepal.