Turkmen gas has high hydrogen sulfide content and therefore requires considerable processing to be marketable and more environmentally friendly. Apart from the southern Korepzhe-Kurt Kui pipeline (a spur to the Islamic Republic of Iran, with relatively low capacity, that was constructed after independence) the only export route was an old pipeline via Kazakhstan and the Russian Federation. Turkmenistan remains confident that it has enough gas reserves to serve all potential customers in the medium to long term.