Fehmarn Belt

Strait
Fehmarn Belt, 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. Ferries operated by Scandlines connect Puttgarden and... Wikipedia
Max. depth: 30 m (98 ft)
Max. length: 25 km (16 mi)