Asian Highway 1 (AH1) is the longest east-west route of the Asian Highway Network, running 20,557 km from Tokyo, Japan via Korea, China, Southeast Asia, Bangladesh, India, Pakistan, and Iran to the border between Turkey and Bulgaria west of Istanbul where it joins end-on with European route E80, running all the way to Lisbon, Portugal.

Japan

The 1200-kilometre section in Japan was added to the system in November 2003. It runs along the following tolled expressways: From Fukuoka, the Japan–Korea Undersea Tunnel has been proposed to provide a fixed crossing.

South Korea

The section in South Korea mainly follows the Gyeongbu Expressway. The Highway Boundary of South and North Korea.

North Korea

China

Guangzhou - Shenzhen branch

Hong Kong

Vietnam

In future, will become part of AH1 instead of the current National Highway 1 and National Highway 22.

Cambodia

Thailand

Myanmar

India (East)

Bangladesh

India (West)

Pakistan

Afghanistan

Iran

Turkey

Connection to E80

The route AH1 links to in Turkey. The E80 continues in the E-road network from the border station at Gürbulak in Turkey to Istanbul followed by E80 highways to Kapitan Andreevo/Kapıkule, Sofia, Niš, Pristina, Dubrovnik, Pescara, Rome, Genoa, Nice, Toulouse, Burgos, Valladolid, Salamanca and finally Lisbon on the Atlantic Ocean.