By car:
The shortest way: via Tarvisio (Italy) – Bovec – Soča
The most picturesque and winding road: via Kranjska Gora – Vršič – Soča
The longest way: via Nova Gorica – Kobarid – Soča
By bus:
Nomago: Ljubljana – Kranjska Gora (bus change) – Vršič – Trenta – Soča
GPS:
46.34112, 13.68467