Pieniny National Park (Polish: Pieniński Park Narodowy) is a protected area located in the heart of the Pieniny mountains in the southernmost part of Poland. It is the oldest national park in Poland. Administratively, the park lies in the Lesser Poland Voivodeship on the border with Slovakia. Its head office is in Krościenko nad Dunajcem. The Pieniny mountain chain is divided into three ranges: Pieniny Spiskie, Małe Pieniny, and the Pieniny Właściwe range where the Park is located. The park's area is 23.46 square kilometres (9.06 sq mi), of which 13.11 km2 is forested. One-third (7.5 km2) is strictly protected. On the Slovak side of the mountains there is a parallel park called the Pieninský národný park.