There are 3 volcanoes in Bali: Mount Agung, Mount Bratan, and Mount Batur. Mount Agung or Gunung Agung is the tallest volcano in Bali. It last erupted in 1963-64 and is still active per today. Mount Agung has a large and very deep crater which occasionally releases smoke and ash. The 1963 eruption of Agung volcano occurred after 100 years of slumber. Many residents still remember the eruption that came with loud noises and a cloud rising from the crater, followed by the ejection of bombs and blocks. Nowadays many people trek the volcano to test their fitness and enjoy the beautiful scenery from the top. The routes are the most difficult follow than other volcanoes, and trekkers are advised to hire guides
Mount Bratan is a large caldera of unknown age in north-central Bali, Indonesia. It measures 11 x 6 km and is known for its scenic beauty and hot springs, it contains 3 lakes - Danau Tamblimgam, Danau Buyan, and Danau Bratan, also waterfall, and a botanical garden. The Temple at Lake Bratan (Pura Ulun Danu Bratan) is one of the most iconic temples in Bali, and probably is Bali’s most photographed temple on the island after Tanah Lot.
Mount Batur is the most active volcano on the popular tourist island of Bali and one of Inondesia's more active ones. During the past centuries, Batur has had a number of small eruptions every few years. . The 1717-m-high Batur stratovolcano has produced vents over much of the inner caldera. Thanks to the scenic beauty of the caldera with its lake and the cone of Batur, it is one of Bali's most popular destinations. Sunrise treks to Batur are a popular option. People get up at the 2 am and then start the trek around 4 am. At the top of the climb trekkers will be rewarded with magical view of sunrise. Historical eruptions have been characterized by mild-to-moderate explosive activity sometimes accompanied by lava emission. Basaltic lava flows from both summit and flank vents have reached the caldera floor and the shores of Lake Batur in historical time.