In the early twentieth century, Mount Kilimanjaro and the adjacent forests were declared a game reserve by the German colonial government. In 1921, it was designated a forest reserve. In 1973, the mountain above the tree line (about ) was reclassified as a national park. The park was declared a World Heritage Site by the United Nations Educational, Scientific and Cultural Organization in 1987. In 2005, the park was expanded to include the entire montane forest, which had been part of the Kilimanjaro Forest Reserve.