Originating from the depths of the Kupup Lake in Sikkim, the Jaldhaka River flows down the hills to be joined by the Bindu Khola and Dudh Pokhri, at a place called Bindu, near the Indo-Bhutanese border in Kalimpong district of West Bengal. A large hydel power project was built on the fast-flowing river. The dam was built at Bindu and the hydel power project was housed in Jhalong. Gradually the area turned into a tourist attraction.