The Beihai Tunnel (Chinese: 北海坑道; pinyin: Běihǎi Kēngdào) is a tunnel in Dongyin Township, Lienchiang County, Taiwan.

The armed forces started the construction of the tunnel in 1968 and completed it in 1970.

[1] In February 2001, the tunnel was handed over to Matsu National Scenic Area Administration which then renovated it.

At the end of the tunnel, there are statues of eight workers who perished during the construction.

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