Pura Ulun Danu Beratan (Pura Bratan) is a major Hindu Shaivite water temple complex located on the shores of Lake Bratan in the mountains near Bedugul. Water temples serve the entire region in the outflow area; downstream there are many smaller water temples that are specific to each subak irrigation area.

Built in 1633, this temple is used for offerings ceremonies to the Balinese water, lake and river goddess Dewi Danu. This is due to the importance of Lake Bratan as a main source of irrigation in central Bali. The 11-storey pelinggih meru in the complex is dedicated to Shiva and his consort Parvathi. Buddha's statue is also enshrined in the temple. This temple is also called  "Bali temple on the lake" because it looks like it is floating when the Bratan river water rises.

Lake Bratan is known as the Lake of Holy Mountain due to the fertility of this area. Since it is located 1200 m above sea level, it has a cold tropical climate.