Yanar Dag is a natural gas fire which blazes continuously on a hillside on the Absheron Peninsula on the Caspian Sea near Baku, the capital of Azerbaijan. Flames jet into the air 3 metres from a thin, porous sandstone layer. Administratively, Yanar Dag belongs to Absheron District of Azerbaijan.
Unlike mud volcanoes, the Yanar Dag flame burns fairly steadily, as it involves a steady seep of gas from the subsurface. It is claimed that the Yanar Dag flame was only noted when accidentally lit by a shepherd in the 1950s. There is no seepage of mud or liquid, which distinguishes it from the nearby mud volcanoes of Lökbatan or Gobustan.
Coordinates 40°30'7.417" N 49°53'31.169" E