This article discusses transportation in the U.S. state of Alaska. Alaska has a small population within a very large geographic area. The geographic differences mean that no single transportation strategy works for the state as a whole. Roads connect the major Southcentral population centers with Fairbanks and the Canadian border. Barges supply the communities along the coast and major rivers, and a ferry system supports the coastal communities in the south. A railroad connects the ports of Seward, Whittier, and Anchorage with the interior via Fairbanks. Many interior communities are connected by seasonal ATV trails when the weather is cold enough to freeze otherwise impassable grounds. Air travel is the critical connection between these various regions.