In the west of Turkmenistan there are about 30 mud volcanoes. They are of various forms and exteriors. Periodically they throw up a mixture of mud masses, gases, waters and oil on the surface.
The biggest volcano is called Aligul (extinct). The most ancient is the Boyadag mud volcano.
The most attractive are Geokpatlauk and Kipyushchiy (Boiling) Mound in Gassankuli. There are even more extinct volcanoes on the Caspian Sea coast.