| Country: | EUR |
| Type: | E |
| Route: | 123 |
| Length Km: | 2760 |
| Map Alot: | Afghanistan |
| Direction A: | North |
| Terminus A: | Chelyabinsk, Russia |
| Junction: | Troitsk Kostanai Derzhavinsk Kyzylorda Shymkent Tashkent Lyagin Koshkent Istaravshan Dushanbe |
| Direction B: | South |
| Terminus B: | Panji Poyon, Tajikistan-Afghanistan |
| Countries: |  Kazakhstan Uzbekistan Tajikistan Afghanistan |
European route E123 is a Class A north-south reference European route that connects the Ural region with Central Asia, spanning 2760km (1,720miles).
The E123 routes through four Asian countries:
Chelyabinsk - Troitsk - border with Kazakhstan
Kostanai - Zapadnoye
Zapadnoye – Esil – Derzhavinsk – Arkalyk – Zhezkazgan
Zhezkazgan – Kyzylorda
Kyzylorda – Shymkent
Shymkent – Frontovoy - Border of Uzbekistan
Border of Kazakhstan - G‘ishtko‘prik - Tashkent - Chinoz - Sirdaryo
The E123 is only signed in Russia and Kazakhstan. In Russia (as well as and Kazakhstan), European route numbers are signposted on direction signs, however this is not the case in many other Asian countries.[1]