The tunnel runs between Snartemo Station in the village of Snartemo in Hægebostad municipality and the Kvinesdal valley about 5 kilometres (3.1 mi) northeast of Liknes in the municipality of Kvinesdal.

The tunnel was opened in 1943 when the Sørlandet Line was extended to Moi Station.

The 9,065-metre (29,741 ft) long tunnel includes a 9,020-metre (29,590 ft) long straight stretch, the longest straight stretch on the entire Norwegian railway network and about 5 metres (16 ft) longer than the one in Romeriksporten.

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