The lake which was used by the priests for ritual washing and ritual navigation is known as a sacred lake. Khecheopalri Lake is a sacred lake which is 35 km from Pelling. It is originally known as Kha-Chot-Palri and is located near Khecheopalri village. It is considered as a sacred site of pilgrimage by the Buddhists.
So, the correct answer is 'Kheceopalri Lake of Sikkim'.