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Mount Ijen (pronounced ee-jen), located in East Java, Indonesia, is an active volcano that is part of the Ijen UNESCO Global Geopark. It is home to one of the most acidic crater lakes in the world, with an enchanting turquoise colour. This remarkable site also features the rare and mesmerising blue fire phenomenon, believed to be one of the only two places on Earth where it can be observed. The blue flames result from sulphuric gases emerging from volcanic fissures, igniting upon contact with atmospheric oxygen. The entire volcanic landscape of the Ijen region is otherworldly, and an absolute must-visit.