Fehmarn Belt (German pronunciationⓘ) (Danish: Femern Bælt, former spelling Femer Bælt; Low German: Femernbelt) is a strait connecting the Bay of Kiel and the Bay of Mecklenburg in the western part of the Baltic Sea between the German island of Fehmarn and the Danish island of Lolland.

The strait features an 18-kilometre-wide (11 mi) wide area with depths of 20–30 metres (66–98 ft).

[1] The Danish and German governments agreed on 29 June 2007 to build a fixed link to replace the ferry route.

In 2011, the Danish parliament voted overwhelmingly (with seven of eight parties supporting) for the €5.1 billion project that was intended to open in 2020.

[2] The tunnel is to have three separate bores, two containing two motorway lanes each, and one with a double-track railway line.