The Southern Gas Corridor is an initiative of the European Commission for a natural gas supply route from Caspian and Middle Eastern regions to Europe, proposed in 2008. The goal of the Southern Gas Corridor is to reduce Europe's dependency on Russian gas and add diverse sources of energy supply. The route from Azerbaijan to Europe consists of the South Caucasus Pipeline, the Trans-Anatolian Pipeline, and the Trans Adriatic Pipeline. The total investment of this route is estimated US$35 billion. The main supply source would be the Shah Deniz gas field, located in the Caspian Sea.