The Argentine Monte, or Low Monte, is an ecoregion of dry thorn scrub and grasslands in Argentina. It is one of the driest regions in the country. Human settlements are mainly near water supplies such as rivers or oases.
The Santa Marta montane forests is an ecoregion in the Sierra Nevada de Santa Marta, a massif on the Caribbean coast of northern Colombia. This montane ecoregion is a characteristic moist forest; however, it rises from very different habitat of xeric scrub and dry forest that surround it.
The Guajira/Barranquilla ecoregion along the Caribbean Sea in Venezuela and Colombia is a unique xerophytic area in the neotropics. Proposed as a bird center of endemism, this arid habitat is dominated by thorn scrub and succulents.
The Cerrado is the largest savanna region in South America and the largest ecoregion in the Americas. It encompasses central Brazil as well as small portions of northeastern Paraguay and eastern Bolivia. Biologically the richest savanna in all the world, it contains an extraordinary amount of biodiversity.
The Bolivian Yungas is a tropical and subtropical moist broadleaf forest ecoregion in the Yungas of west-central Bolivia and extreme southeastern Peru. Steep terrain, high precipitation, and difficult access have kept much of this ecoregion in a natural state.
The Bolivian montane dry forests ecoregion in Bolivia, on the eastern side of the Andes, is a transitional habitat between the puna grasslands higher up to the west and the Chaco scrub to the east. This dry region is characterized by steep hillsides, cliffs and valleys.
The southwest Amazon moist forest region covers an extensive area of the Upper Amazon Basin. The inaccessibility of this region, along with few roads, has kept most of the habitat intact. Also, there are a number of protected areas, which preserve this extremely biologically rich ecoregion.
Situated in southeastern Venezuela in northern South America, the Guayanan Highlands ecoregion is distinct from other ecoregions in Amazonia due to its montane physiography. It hosts vast expanses of tall primary rain forest and open, treeless or nearly treeless savannas interrupted by gallery forests.