Río Negro. 07/06/95; Alto Paraguay; 370,000 ha; 19°52'S 058°34'W. A riverine system of meanders and oxbow lakes set in an ecotone arising from the confluence of three biogeographic provinces, with representative fauna from all. Considered a world centre of floral genetic diversity, numerous rare and threatened species of flora and fauna are supported. Some livestock rearing, timber extraction, and poaching take place. A border is shared with both Bolivia and Brazil. Ramsar site no. 729. Most recent RIS information: 1995.

Alto Paraguay