Iran Gas Trunk-line (IGAT) is the series of large diameter pipelines constructed from gas refineries in the south of Iran (Kuzestan and Bushehr Provinces) in order to transfer natural gas to the consumption centers in overall of the country.
As of 2008, there are five trunk-line in operation, two under construction and two under planning.
IGAT1 was completed in October 1970, supplying the Southern Caucasus republics of the Soviet Union. In 1975 the National Iranian Gas Company concluded agreements with Ruhrgas, Gaz de France, the Soviet Union, and Austria's OMV, to supply gas to Western Europe via a proposed IGAT II. Under the arrangement, Iran was to supply additional gas to the Soviet Union, while the Soviet Union was to pipe gas to Czechoslovakia from its own gas fields in Siberia. Construction of IGAT II halted following the Iranian Revolution.