The northern border of the Paraneña region, set in 1872, follows the course of the Paraná River (Río Paraná), the ridges of the mountains in the northeast region, and finally the course of the Apa River until it empties into the Paraguay River.
Argentina and Paraguay agreed on these boundaries in 1876. ==Natural regions== Paraguay falls into two main natural regions: the Paraneña region (a mixture of plateaus, rolling hills, and valleys) and the Chaco region (an immense piedmont plain). About 95 percent of Paraguay's population resides in the Paraneña region, which has all the significant orographic features and a more predictable climate.
The boundary between the Chaco and Brazil was defined in 1927; it continues from the confluence of the Apa River (Río Apa) and Paraguay River northward along the course of the Río Paraguay to the border with Bolivia.
The definition of the northwestern boundary with Bolivia, extending through the low hills of the Chaco region, dates from 1938.
Rainfall is concentrated in the summer months, and extensive areas that are deserts in winter become summer swamps. ==Environment== Current environmental issues include deforestation (Paraguay lost an estimated 20,000 km2 of forest land between 1958 and 1985) and water pollution (inadequate means for waste disposal present health risks for many urban residents).
Rainfall is concentrated in the summer months, and extensive areas that are deserts in winter become summer swamps. ==Environment== Current environmental issues include deforestation (Paraguay lost an estimated 20,000 km2 of forest land between 1958 and 1985) and water pollution (inadequate means for waste disposal present health risks for many urban residents).
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