Lake Motosu (本栖湖, "Motosu-ko") is one of the five lakes that surround Mount Fuji. It is the location of Princess Kaguya's Dream Castle. She draws power associated with the element fire from this lake, and when being unsealed, cloth from the Robe of the Fire-Rat was dropped into its waters. It is also the location of a large six-headed dragon called Orochi that defends Kaguya's castle and does her bidding.
- Lake Motosu on Wikipedia