|Turkish Prime Minister Recep Tayyip Erdogan, right, and his Greek counterpart Kostas Karamanlis cheer after a ceremony at the Turkey-Greece border in Tekirdag|
Greece's Costas Karamanlis and Turkey's Recep Tayyip Erdogan attended the ceremony on a bridge across the river that separates the two countries.
Both leaders underlined what they called the the historic and strategic nature of the project. The pipeline will carry gas from Azerbaijan and other Caspian and Caucasus producers to markets in Europe.
The 300 kilometer pipeline is expected to be operational in 2006, and will later be extended to Italy. It will carry more than 11 billion cubic meters of gas per year once connections are made at other planned pipelines.
Some information for this report provided by AFP and AP.