The desert crater located about 260 kilometers (160 miles) north of the capital, Ashgabat, has burned for decades and is a popular sight for the small number of tourists who come to Turkmenistan, a country which is difficult to enter.
The Turkmen news site Turkmenportal said a 1971 gas-drilling collapse formed the crater, which is about 60 meters (190 feet) in diameter and 20 meters (70 feet) deep. To prevent the spread of gas, geologists set a fire, expecting the gas to burn off in a few weeks.