The Kattegat separates which two countries?

The Kattegat is a 30,000 km2 (12,000 sq mi) sea area bounded by the Jutlandic peninsula in the west, the Danish Straits islands of Denmark to the south and the provinces of Västergötland, Scania, Halland and Bohuslän in Sweden in the east. The Baltic Sea drains into the Kattegat through the Danish Straits. The sea area is a continuation of the Skagerrak and may be seen as a bay of the Baltic Sea or the North Sea.

The Kattegat is a rather shallow sea and can be very difficult and dangerous to navigate. In modern times, artificial seabed channels have been dug, many reefs have been dredged by sand pumping, and a well-developed light signaling network has been installed, to safeguard the very heavy international traffic of this small sea.

There are several major cities in the Kattegat, including Gothenburg, Aarhus, Aalborg, Halmstad and Frederikshavn, mentioned by descending size.

According to the definition established in a 1932 convention signed by Denmark, Norway and Sweden, the northern boundary between the Kattegat and Skagerrak is found at the northernmost point of Skagen on Jutland, while the southern boundary towards Øresund is found at the tip of Kullen Peninsula in Scania.

The Kattegat Bridge is a proposed bridge in Denmark across the southern portion of the Kattegat between the Jutland peninsula and the island of Zealand. If constructed, the bridge would connect Aarhus with Kalundborg in two segments (via Samsø) totaling about 35 kilometres (22 mi).