Pacaya-Samiria National Reserve is a vast area of Amazonian jungle and floodable forest in northeastern Peru, bordered by the Marañón and Ucayali rivers. Known for its biodiversity, it shelters animals from pink dolphins to spider monkeys and giant South American turtles. It's also home to hundreds of bird species, like colorful macaws. Lakes in the reserve include the El Dorado lagoon, in the Yanayacu-Pucate Basin.