The Münden Tunnel (German: Mündener Tunnel) is a railway tunnel on the Hanover-Würzburg high-speed rail line in Germany. It is situated south of the town of Hann. Münden between Göttingen and Kassel. At a total length of 10,525 metres, it is the second longest tunnel in Germany after the Landrücken Tunnel. The tunnel was built between 1983 and 1989. At the northern portal, which is located at (51°24′12″N9°42′31″E), the trains cross the valley of the river Werra on the Werra Viaduct at Hedemünden, parallel to the A 7 autobahn.