Chaco Boreal

Region of distinctive vegetation occupying about 100,000 square miles (259,000 square km) in northwestern Paraguay, southeastern Bolivia, and northern Argentina. The region is part of the vast, arid lowland known as the Gran Chaco (q.v.). The Chaco Boreal's land is flat and is marked by deciduous scrub woodlands to the west of the Paraguay River that include the quebracho, a tree valuable