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|---|---|
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| Route information | |
| Length | 337 km (209 mi) |
| Major junctions | |
| From | Sassari |
| Olbia | |
| To | Civitavecchia |
| Location | |
| Countries | Italy |
| Highway system | |
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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.