Lake Tamblingan (Indonesian: Danau Tamblingan) is a caldera lake located in Buleleng Regency, Bali. The lake is located at the foot of Mount Lesung in Munduk administrative village, Banjar subdistrict, Buleleng Regency, Bali, Indonesia. The lake is one of the three lakes that formed inside an ancient caldera, the other lakes to the east of Lake Tamblingan are Lake Buyan and Lake Bratan. Tamblingan lake is a pristine lake surrounded with dense rainforest and archaeological remnants of the 10th-century Tamblingan civilization. The lake and the surrounding settlements is designated as a spiritual tourism area protected from modern development by the government.
Lake Tamblingan lies in a plateau inside an ancient volcanic caldera. Inside the caldera are several dormant ancient volcanoes and other caldera lakes to the east of Lake Tamblingan: Lake Buyan and Lake Bratan. Lake Tamblingan is the smallest lake inside the caldera. The lake location, over a 1000 meter high plateau, gives it an alpine climate. Pristine rainforest with orchids and macaques covers the shore of Lake Tamblingan. Only one village exist on the shore of Lake Tamblingan, the village of Gubug, at the southern shore of the lake.
