First of all it's in the Scandinavian area. Denmark has one of the Scandinavian languages. There is much interaction between the Scandinavian countries.
Denmark borders only one country.
Norway
Norway
Norway
Norway
Do you mean Norway which is maybe the most mountainous country in the world. Peru also has a long mountain chain.
The topography of Italy varies as one moves about the country. The mainland is very mountainous, but portions of the north are very flat.
No, Japan is not a flat country. It is a mountainous archipelago, with approximately 73% of its land covered in mountains. The mountainous terrain is one of the defining features of Japan's landscape.
Norway is the Scandinavian country that has oil wealth, primarily due to its significant oil reserves in the North Sea. The country has managed its oil wealth through the Government Pension Fund Global, one of the world's largest sovereign wealth funds.
There are no continous mountain range on the Scandinavian penninsula. But the most dominating one on a map, is called Jotunheimen. Located in Norway.
Colorado is one of the most mountainous states in the USA.