Final answer:
The Scandinavian Mountains cover much of Norway and extend into Sweden and Finland, are part of Europe's Western Highlands, and contribute to the distinct northerly landscapes of these countries.
Step-by-step explanation:
The mountain range that covers much of Norway and extends into Sweden and Finland is known as the Scandinavian Mountains or the Scandes.
This range is part of the larger Western Highlands of Europe, a region characterized by rugged terrain and sparse populations. While the Scandinavian Mountains are not as densely populated as other parts of Europe, they are significant due to their extensive coverage across the northern portion of the Scandinavian Peninsula, contributing to the distinct landscapes of Norway, Sweden, and Finland.