The Hải Vân Tunnel, the second longest tunnel in Southeast Asia and the longest in Vietnam at 6.28 km (3.90 mi), lies on Highway 1 between the two cities of Da Nang and Huế in central Vietnam.

From Wikipedia (CC BY-SA 4.0).

Key facts

Country: Vietnam

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Overview

The Hải Vân Tunnel, the second longest tunnel in Southeast Asia and the longest in Vietnam at 6.28 km (3.90 mi), lies on Highway 1 between the two cities of Da Nang and Huế in central Vietnam.

From Wikipedia (CC BY-SA 4.0).