The great variety in geography, flora and fauna across Colombia has also resulted in the development of an ecotourist industry, concentrated in the country's national parks. Popular ecotourist destinations include: along the Caribbean coast, the Tayrona National Natural Park in the Sierra Nevada de Santa Marta mountain range and Cabo de la Vela on the tip of the Guajira Peninsula; the Nevado del Ruiz volcano, the Cocora valley and the Tatacoa Desert in the central Andean region, the Farallones de Cali National Natural Park, in the departament of Valle del Cauca; Amacayacu National Park in the Amazon River basin; and the Pacific islands of Malpelo and Gorgona, there other unique landscapes like the river of the seven colors in Meta. As of 2018, there are nine World Heritage Sites in Colombia, including six cultural sites, two natural sites and one mixed site.