Denali National Park encompasses more than 6 million acres (24,500 km²), of which 4,724,735.16 acres (19,120 km²) are federally owned. 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.