We stopped here quickly after a day trip through our driver's (Putu Sudiana - highly recommend Putu's service for travel anywhere in Bali!) village up to Lovina and back to Legian. My pics don't do justice to the sheer size of the combined lakes, so I have borrowed a map courtesy of wikitravel.org.
Bedugul is the name used to cover a large area of the central highlands of Bali around the villages of Bedugul itself, Candikuning, Pancasari, Pacung and Wanagiri (amongst others). The focus point of the area centres on the three crater lakes of Bratan (Beratan), Buyan and Tamblingan, and the nearby botanical gardens. The whole area is at an altitude of 700 metres or more, with the tallest mountain peaks above 2,000 metres, and it can be distinctly chilly here.