The Maursund Tunnel is an undersea tunnel in Troms county, Norway. The tunnel goes under the Maursundet strait connecting the mainland part of Nordreisa Municipality with the island of Kågen in Skjervøy Municipality. The 2,122-metre (6,962 ft) long tunnel reaches a depth of 92.5 metres (303 ft) below sea level and has a 10% grade in some parts of the tunnel. The tunnel, which was opened in 1991, and the nearby Skattørsundet Bridge connect the large village of Skjervøy to the mainland.