Attiki Odos is a privately owned toll motorway system in Greece. The Attiki Odos motorways form the outer beltways of the Greater Athens metropolitan area. The total length of the motorways is 70 kilometres (43 mi). The Attiki Odos system consists of the following motorways:A6: Eleusis - Athens International Airport A61: Markopoulo - Lavrio (planned) A62: Koropi - Athens International Airport A63: Ilioupoli - Paiania (planned) A64 : Katechaki Avenue - Pallini A65 : Skaramagas - Ano Liosia A642: Doukissis Plakentias Avenue - Agia Paraskevi

Athens is the capital and largest city of Greece. A major coastal urban area in the Mediterranean, Athens is also the capital of the Attica region and is the southernmost capital on the European mainland. With its urban area's population numbering over three million, it is the eighth largest urban area in the European Union. The Municipality of Athens, which constitutes a small administrative unit of the entire urban area, had a population of 643,452 (2021) within its official limits, and a land area of 38.96 km2 (15.04 sq mi).