The Georgian S1 route, is a "road of international importance" with a registered length of 542.7 kilometres (337.2 mi) within the Georgian classification system, which makes it the longest Georgian highway route. It runs from Tbilisi via Mtskheta, Gori, Khashuri, Zestaponi, Kutaisi, Samtredia, Senaki, Zugdidi, Sukhumi and Gagra to the border with Russia near Leselidze at the northwestern tip of the country, covering in practice 537 kilometres (334 mi). After crossing the Georgia–Russia border in breakaway Abkhazia, the highway continues to Sochi and Krasnodar as A147. It is part of European E60, E97 and E117 routes and Asian Highways AH5, AH81 and AH82, and connects with six other S-routes.

European route E 60 is the second-longest road in the International E-road network and runs 8,200 km (5,100 mi), from Brest, France, to Irkeshtam, Kyrgyzstan.