Yanar Dag ("burning mountain") is a natural gas fire that blazes continuously on a hillside in Azerbaijan (known as the “Land of Fire”), near the capital Baku. There are only a few fire mountains still in existence and most are located in Azerbaijan due to its large concentration of natural gas.
The flames at Yanar Dag eap three metres (9.8 ft) into the air from a thin, porous sandstone layer on a hillside in the Absheron Peninsula near the Caspian Sea. Popular myth has it that they were only discovered when a shepherd lit them by accident in the 1950s.
Unlike the nearby mud volcanoes of Lökbatan or Qobustan, there is no seepage of mud or liquid. The Yanar Dag flames burn steadily, fed by gas from just below the surface. They come from vents in the sandstone formations and there is an unmistakable smell of gas.