Final answer:
The Skagerrak channel lies between Norway and Denmark, connecting the North Sea to the Kattegat, and is a significant part of Western Europe's geography.
Step-by-step explanation:
The channel that forms much of the coast of Norway separating it from Denmark is known as the Skagerrak. The Skagerrak connects with the North Sea and lies at the northern end of the Jutland Peninsula, where Denmark is located.
This body of water also connects to the Kattegat, which then extends to the Baltic Sea, but it is specifically the Skagerrak that defines the separation between Norway and Denmark. This channel is significant for navigation and is a key geographical feature in Western Europe.