Iguaçu National Park is a national park in Paraná State, Brazil. It comprises a total area of 185,262.5 hectares and a length of about 420 kilometers (260 mi), 300 kilometers (190 mi) of which are natural borders by bodies of water and the Argentine and Brazilian sides together comprise around 260,000 hectares. Iguaçu National Park was created by federal decree nr. 1035 of 10 January 1939 and became a UNESCO World Heritage Site in 1986. The park is managed by Chico Mendes Institute for Biodiversity Conservation (ICMBio).