Linked from
The 10 pages that link to Kattegat, each with the reason it gives.
Baltic SeaRelated: It forms an intermediate waterway between the Danish straits and the North Sea.
North SeaRelated: It continues the North Sea’s connection toward the Baltic through the Skagerrak.
SkagerrakRelated: This adjoining sea forms the Skagerrak’s eastern connection.
Trollhätte CanalRelated: The canal’s western outlet opens onto this sea.
VänernRelated: Vänern’s outflow ultimately reaches this sea through the Göta älv.