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 field, an offshore oilfield in the Pechora Sea that will include up to 40 wells, is currently under construction and drilling is expected to start in early 2012. It will have the world's first ice-resistant oil platform and will also be the first offshore Arctic platform. Russia wants to establish its Arctic possessions as a major resource base by 2020. As climate change makes the Arctic areas more accessible, Russia, along with other countries, is looking to use the Arctic to increase its energy resource production. According to the U.S. Geological Survey, there are of oil and of natural gas