Norway is the furthest north among the Scandinavian countries, reaching up to the Arctic Circle.
Norway extends furthest north, reaching up to the Svalbard archipelago near the North Pole.
Norway extends the farthest north among the Scandinavian countries, with its northernmost point located on the island of Svalbard. Sweden and Finland also have territory in the Arctic Circle, but not as far north as Norway.
The continent that extends the furthest west is North America. On the other hand, the continent that extends the furthest east is Asia.
Nunavut, Canada, is the furthest north but Greenland cartographers have found that Kaffeklubben Island (not a country) is farther north than any previously known point of land.
Norway extends further north than any other European country. Its northernmost point is the Arctic archipelago of Svalbard, located at 81 degrees north latitude.
Reykjavik, capital of iceland is said to be furthest north.
If, by "country", you refer to the sovereign territory of a Nation-State, and if by "furthest North" you mean extends furthest to the North, then the answer is almost certainly Denmark, which includes the territory of Greenland. Canada (Ellesmere Island) would run a close second, followed by Russia (Franz Josef Land) and Norway (Svalbard). It is possible that there are minor islands further to the North than Greenland, which might be part of the territory of another Nation-State (most probably Canada, Russia, Norway, Finland, or Sweden), but that seems unlikely.
The country whose capital is the furthest north is Iceland. Reykjavik, the capital of Iceland, is the northernmost capital city in the world.
Norway
The Spanish-speaking country that is furthest north is Mexico. Its northernmost point is at the border with the United States along the Rio Grande.
Norway.