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 Semiarid Pampas ecoregion is located in the center of Argentina. The predominant vegetation consists of grasslands with some shrubs. There are few endemic plants in the ecoregion but the area has a high biodiversity.
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.
This Guiana Highlands ecoregion in northern South America is host to an archipelago of isolated sandstone plateaus and dramatic summits atop nearly vertical escarpments. The tepuis are the remains of the ancient sandstone tableland overlying the even more ancient granitic Guayana Shield.
The "selva parananese" or Upper Paraná Atlantic Forest is an ecoregion of the tropical moist forests biome and the South American Atlantic Forest biome. The ecoregion stretches across the borders of southern Brazil, eastern Paraguay and northeastern Argentina.
The Uruguayan savanna is a subtropical grassland and savanna ecoregion that extends from the extreme southern part of the Rio Grande do Sul, a Brazilian state, to include the entire country of Uruguay and a small section of the Argentinean province of Entre Ríos.
The Valdivian temperate forests ecoregion is located in the southern cone of South America. It covers a narrow continental strip between the western slope of the Andes and the Pacific Ocean. The forests are characterized by their dense understories of bamboos, ferns, and evergreen trees.
The Venezuelan Andes Montane Forests ecoregion is located in the northern arm of the Andes. Surrounded by xeric valleys and páramo, the richness of species and large number of endemic species make this ecoregion one of the most interesting areas of Venezuela in terms of biodiversity.