Nabucco aims to bring natural gas from the Caspian Sea region to Europe. It envisages a 3300 km, 56 inch diameter pipeline transportation system running through five countries (Turkey, Bulgaria, Romania, Hungary and Austria) until it reaches it goal at the central European gas hub Baumgarten in lower Austria. Nabucco has been included in the trans European energy network of the European Union and is anticipated to enhance European energy security by adding new sources of natural gas to Europe’s portfolio of suppliers. Prospective suppliers are Azerbaijan and Russia. Turkmenistan and Kazakhstan have also been considered, each with abundant reserves of natural gas in their own right. Political considerations have thus far kept Iran out of the supply picture, yet including Iran and its immense gas reserves would yield long-term benefits for Nabucco and provide Europe with greater security of supply.