E840
Route information
Length	337 km (209 mi)
Major junctions
From	Sassari
Major intersections	Olbia
To	Civitavecchia
Location
Countries	Italy
Highway system
International E-road network A Class B Class

European route E 840 is a European B-class road in Italy, connecting the cities Sassari in Sardinia to Tarquinia in mainland Italy where it connects to E80.

Route

•  Italy
  • E25 Sassari
  • Olbia
  • gap across the Tyrrhenian Sea
  • Civitavecchia
  • E80 Tarquinia