The marsh deer ("Blastocerus dichotomus"), sometimes known as the swamp deer [http://www.ultimateungulate.com/Artiodactyla/Blastocerus_dichotomus.html] (not to be confused with the barasingha, which can sometimes be called the swamp deer), is the largest deer species from South America reaching a length of and a shoulder height of . It is found in Argentina, Bolivia, Peru, Brazil, Uruguay and Paraguay. Formerly found in much of tropical and subtropical South America, it ranged east of the Andes, south from the Amazon rainforest, west of the Brazilian Atlantic rainforest and north of the Argentinian Pampa. Today it is largely reduced to isolated populations at marsh and lagoon zones in the Paraná, Paraguay, Araguaia and Guapore river basins. Small populations also occur in the southern Amazon, including Peru where protected in Bahuaja-Sonene National Park. It is listed as a vulnerable species by the IUCN and on CITES Appendix I.