Arctic Circle level, although in mountainous regions there is often no direct view of the true horizon. Only four million people live north of the Arctic Circle due to the severe climate; nonetheless, some areas have been settled for thousands of years by indigenous peoples, who today make up 10% of the region's population. Tens of thousands of years ago, waves of people migrated from eastern Siberia across the Bering Strait into North America to settle. The largest communities north of the Arctic Circle are situated in Russia, Norway and Sweden: Murmansk (population 307,257), Norilsk (175,365), Tromsø (71,295), Vorkuta (59,231) and Kiruna
Arctic policy of Russia expedition resulted in 62 large maps and charts of the Arctic region. Modern Russian territorial claims to the Arctic officially date back to April 15, 1926, when the Soviet Union claimed land between 32°04'35"E and 168°49'30"W. However, this claim specifically only applied to islands and lands within this region. The first maritime boundary between Russia and Norway, from the Varangerfjord, was signed in 1957. However, tensions resurfaced after both countries made continental shelf claims in the 1960s. Informal talks began in the 1970s about determining a boundary in the Barents Sea to settle differing claims, as Russia wanted the boundary