Paraguay

The Atlantic Forest, or Mata Atlântica, runs along the coast of eastern and southeastern Brazil, stretching inland into Argentina and Paraguay. Although only a very small part of the original forests remain, it is still one of the most diverse ecosystems on the planet.

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 Paraguay and Bolivia. Biologically the richest savanna in the world, it contains extraordinary biodiversity.

The Dry Chaco ecoregion, or Gran Chaco, is a sparsely populated, hot, semi-arid lowland alluvial plain of the Río de la Plata basin. It is divided among eastern Bolivia, western Paraguay, northern Argentina, and a portion of Brazil. The Chaco contains South America's second-largest forest after the Amazon.

The El Chaco Biosphere Reserve covers a large area in Paraguay's northern part of the boreal El Chaco system, with ecologically diverse dry forest ecosystems under tremendous pressure to be converted into grazing lands. The reserve has six core areas, all protected areas.

The Guaraní Aquifer System is a large underground groundwater reservoir and hydrogeological system. It is a transboundary aquifer spread across four South American countries: Argentina, Brazil, Paraguay, and Uruguay.

The Itaipu Biosphere Reserve covers an area of over 1,000,000 ha (2,500,000 acres) in eastern Paraguay. It comprises an area of semi-deciduous sub-tropical forest, also known as the Upper Paraná Atlantic Forest.

The Jesuit Missions of Paraguay, La Santísima Trinidad de Paraná and Jesús de Tavarangue, are part of a series of 30 missions in the Río de la Plata basin established by the Society of Jesus (the Jesuits) during the 17th and 18th centuries.

Both the Mbaracayú Forest Natural Reserve and the Bosque Mbaracayú Biosphere Reserve protect a hotspot of biodiversity in the Mata Atlántica biologic corridor. It is a tropical humid forest ecosystem, which includes low and medium altitude Atlantic semi-deciduous forests and savannas.

The Pantanal is a natural region encompassing the world's largest tropical wetland. This gigantic seasonal floodplain lies mainly within Mato Grosso, and Mato Grosso do Sul in the Center-West Region of Brazil. However, small portions extend into northeastern Paraguay and southeastern Bolivia.

The Paraguay River is South America's fifth-largest river, running through Brazil, Paraguay, and Argentina. From the Brazilian state of Mato Grasso to its confluence with the Paraná River in Argentina, it serves as part of the Paraguayan border with Argentina and Brazil.