Why it's the capital
King Haakon V, who ruled from 1299 to 1319, was the first king to live permanently in Oslo, and the city has been regarded as Norway's capital since his reign.
Capital of NorwayOslo sits at the northern end of the Oslofjord in southeastern Norway. On its other sides it is surrounded by green hills and mountains, and about two-thirds of its area is protected forest, hills and lakes.
King Haakon V, who ruled from 1299 to 1319, was the first king to live permanently in Oslo, and the city has been regarded as Norway's capital since his reign.
Follow the long Oslofjord north from the Skagerrak strait to its top end. Oslo lies almost due west of Stockholm, at about the same latitude.
Sources: Wikipedia: Oslo, Wikipedia: Oslofjord, Wikipedia: Oslo City Hall