The Orinoquía region is one of the six natural regions of Colombia that belongs to the Orinoco River watershed. It is also known colloquially as the Eastern Plains from the Spanish Llanos Orientales. The region covers most of the area of the departments of Meta, Arauca, Casanare and Vichada. Biogeographical subregion The Orinoquía region has the following subregions: Plains Foothills: in between the East Andes and the Eastern Plains; elevations ranges between and ; mostly covered by dense tropical humid forest Meta River Plain Arauca Marshlands Serranía de la Macarena Biodiversity The ecosystems of the region are tropical savanna with gallery forests and wetlands along the rivers. Protected areas PNN Serranía de la Macarena PNN El Tuparro PNN Morichales de Paz de Ariporo References Natural regions of Colombia Llanos