The Daravaza Gas crater, also termed the Door to Hell, is a sink hole located in the Karakum desert in Turkmenistan. The sink hole is 30m deep and has had a raging fire contained within it for more than 50 years, beginning in 1971.

The exact origin of the crater is not well documented, but one instance suggests that the crater was accidentally created by a group of geologists near the town of Darvaza. While digging in the area they had hit an underground natural gas deposit that caused the surface to cave in and begin releasing flammable gas from the cavern. In an effort to resolve the issue, the gases were set on fire, with the expectation that the flames would extinguish naturally within a few weeks as the gas supply depleted. However, the exact size of the deposit was underestimated, leaving the pit to burn for decades afterwards. Another theory suggests that a Soviet oil rig once stood at the site but collapsed into the cavern, after which a geologist decided to clean up the area by igniting the pit. Currently, the pit is a large tourist attraction and brings in people from around the world to experience this environmental travesty.