The A6 motorway, also known as the Attiki Odos (Greek: Αττική Οδός), is a toll motorway in Greece that forms the backbone of the motorway system in Athens, also known as the Attiki Odos after the concessionaire. Connecting Eleusis in the west with the Athens International Airport in the east, it forms the northern beltway of Athens. The length of the motorway is 48 kilometres (30 mi).