Boryeong Undersea Tunnel

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6.9 km under the sea to Wonsando

Address

Daecheonhang 1-gil area, Boryeong

A roughly 6.9 km tunnel under the sea from Daecheon Port to Wonsando, opened December 2021 and billed as the fifth longest road undersea tunnel. The under-the-sea feeling lingers the whole drive.