Denali National Park and Preserve is a national park and preserve located in Interior Alaska, centered on Denali, the highest mountain in North America. The park and contiguous preserve encompasses more than 6 million acres (24,500 km²), of which 4,724,735.16 acres (19,120 km²) are federally owned national park. The national preserve is 1,334,200 acres (5,430 km²), of which 1,304,132 acres (5,278 km²) are federally owned. On December 2, 1980, a 2,146,580 acre (8,687 km²) Denali Wilderness was established within the park. Denali's landscape is a mix of forest at the lowest elevations, including deciduous taiga. The preserve is also home to tundra at middle elevations, and glaciers, rock, and snow at the highest elevations. The longest glacier is the Kahiltna Glacier. Today, 400,000 people visit the park annually. Wintertime activities includes dog-sledding, cross-country skiing, and snowmachining.