The granddaddy of all volcanoes, Krakatoa sits off the island of Rabata, just west of Java. The effects of its 19th-century eruption were felt in most parts of the world, and heard as far as 2,500 mi/4,000 km away.
Tours of varying length can be arranged from Jakarta, or have your travel agent book them prior to departure. You can opt for a single-day visit if you're okay with a very early start, or arrange for an overnight stay at a camp in Rabata.
Krakatoa is an active volcanic hot spot, with true eruptions as recent as 2012 and 2018, and smaller eruptions and activity occurring continually. It grows at a rate of five inches a week as a result of its activity. Volcano watchers who visit often see smoke and other signs of this restless mountain.
Since 2009, a pair of active vents have been ejecting incandescent gas visible for long distances at night. Because of this hazard, and its status as a natural wonder of the world, access is restricted to those who get passes. Organized tours include passes and safety training.
Note: Only experienced travelers with some background in dealing with volcanos should attempt a solo visit. The strong currents of the Sunda Straits (between Java and Sumatra) make the passage to the island difficult and can turn a day trip in a fishing boat into a week adrift at sea. If you do go, make sure the boat is in good shape and that it has radio contact and serviceable life jackets.
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