A strait of the North Sea between Jutland and Sweden; connects with the North Sea through the Skagerrak WordNet 3.0 & Open English WordNet

The Kattegat is a 30,000 km2 sea area bounded by the Jutlandic peninsula in the west, the Danish Straits islands of Denmark and the Baltic Sea to the south and the provinces of Bohuslän, Västergötland, Halland and Skåne in Sweden in the east. Wikipedia

Sea area between Denmark and Sweden Wikidata

A body of water between Jutland and the Swedish mainland. Wiktionary

Body of water. Wiktionary (translation)