The International Douro Natural Park (Portuguese: Parque Natural do Douro Internacional) is one of the thirteen natural parks of Portugal. It is located in the municipalities of Miranda do Douro, Mogadouro, Freixo de Espada à Cinta and Figueira de Castelo Rodrigo, spanning a lengthy area along the Douro River where it functions as the border between Portugal and Spain (hence "International Douro"). The park also goes includes the border area of the Águeda River.