The sea between Denmark and Sweden, Kattegat, can be translated to "a fishes cloaca on a cat" from danish

"Katte-" as a prefix means relating to a cat. Eg. "Kattepoter" = "cats paws"

Gat means the cloaca on a fish or a bird (cloaca is the all-in-one hole on fish, birds, etc.)

I realize this is probably a very wrong interpretation, but in that case, i don't want to be right.