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 Institute of North America of the Arctic Science and Technology Information System (ASTIS) database is references for publications and research projects about northern Canada. It contains 70,000 records. Geographic subject coverage encompasses the three territories, the northern parts of seven provinces and the adjacent marine areas. Format coverage includes abstracts, indexed subject terms, geographic terms, and links to 16,000 online publications. The Arctic Institute of North America publishes a peer reviewed, scientific journal, entitled ""Arctic"". The journal publishes scholarly articles, book reviews, and notable people on all topics related to the polar and subpolar regions of the world. Arctic Institute of North America The