What are the four traditional regions of Norway?

Norway is traditionally divided into four distinct regions, three of which are located in the south and one in the north. These regions are:1

• Østlandet (Eastern Norway): Separated from the west by the Lang Mountains, this region lies to the east of the country's central mountain ranges.1
• Vestlandet (Western Norway): Characterized by a narrow coastal zone, numerous islands, and deep, steep-walled fjords.1
• Trøndelag (The Trondheim region): Located to the north of Østlandet, this region is separated from the south by an eastward sweep of mountains.1
• Nord-Norge (Northern Norway): Beginning near the country's midpoint, this region is largely situated above the Arctic Circle and is defined by its mountainous terrain and jagged peaks.1