West Virginia is located in the Appalachian, Upland South, and Mid-Atlantic regions. It is bordered by Virginia, Kentucky, Ohio, Pennsylvania, and Maryland. It covers an area of 24,231 square miles and has a population of 1,818,470 (as of 2006). The state is known for its logging and coal mining industries. It is the second top coal producer. It also produces an excessive amount of electricity and leads the nation in net interstate electricity exports. For tourists, it is known for a wide range of outdoor activities such as hunting, mountain biking, hiking, fishing, caving, rock climbing, whitewater rafting, and skiing.