A coal seam approximately 30 meters under Australia’s Mount Wingen has been burning continuously for approximately 6,000 years, earning the place its famous nickname, Burning Mountain.

Underground coal seam fires are not at all uncommon, in fact it’s estimated that about 1,000 coal seams are burning around the world at any one point. Such fires usually occur in coal-rich but less-developed countries, and are usually put out in a matter of days, a month at most. That’s not always the case though, and India’s Jharia coalfield, which has been burning continuously for over 100 years, is a perfect example. But even this century-old fire pales in comparison with the world’s oldest coal fire, an underground coal seem that has been smoldering for about six millennia.

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Azerbaijan, a small nation located at the crossroads of Western Asia and Eastern Europe, is well known for its rich culture and history. The country is a great tourist destination, with a unique cuisine, ancient monuments, modern architecture, and mud volcanoes. And the most well-known of its volcanoes is Yanar Dag, also known as ‘Burning Mountain’. True to its name, the mountain has been burning for as long as anyone can remember, and the fire isn’t showing signs of going out any time soon.

Situated on the Absheron Peninsula, 25 kilometers northeast of the capital city of Baku, Yanar Dag is a 116-meter hill located on top of a pocket of natural gas that constantly erupts into flames. These flames jet out at least three meters into the air, through a porous layer of sandstone. Unlike the other mud volcanoes of Azerbaijan, Yanar Dag has no seepage of mud or liquid, so the fire always burns.

A 10-meter long wall of fire continuously burns alongside the edge of the hill. This makes for the most spectacular view, especially at night. The air around this open fireplace is always thick with the smell of gas. The heavy Absheron wind, twisting the flames into bizarre shapes, adds to the mystery of the region. Tongues of fire also rise from the surface of the streams located around the hill. These streams are called Yanar Bulaq, or ‘Burning Spring’.

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