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Yosemite National Park (pron.: /joʊˈsɛmɨtiː/ yoh-SEM-it-ee) is a United States National Park spanning eastern portions of Tuolumne, Mariposa and Madera counties in the central eastern portion of California, United States. The park covers an area of 761,268 acres (3,080.74 km2)[2] and reaches across the western slopes of the Sierra Nevada mountain chain.[4] Over 3.7 million people visit Yosemite each year:[3] most spend their time in the seven square miles (18 km2) of Yosemite Valley.[5] Designated a World Heritage Site in 1984, Yosemite is internationally recognized for its spectacular granite cliffs, waterfalls, clear streams, Giant Sequoia groves, and biological diversity.[5] Almost 95% of the park is designated wilderness.[6] Yosemite was central to the development of the national park idea, largely owing to the work of people like Galen Clark and John Muir in getting the Yosemite Grant passed by congress and signed by President Lincoln, paving the way for the United States national park system.[7]