Womb of the World
The Womb of the World is a large lake that lies just west of Vaes Dothrak and the Mother of Mountains. It is a holy place to the Dothraki people and has cool and clean waters. The lake is surrounded by reed, and is reported to have no bottom. A river runs from the lake north through the Kingdom of the Ifequevron to the Shivering Sea.
Merchant caravans are allowed to visit the Western Market of Vaes Dothrak as long as they do not profane the Mother of Mountains or the Womb of the World.
A Game of Thrones
After eating the heart of a stallion as part of a ceremony for her child, Daenerys Targaryen rides to the lake and bathes naked to remove the blood. Afterwards she has sex with Khal Drogo on the shore.