Paraguay is bounded by three substantially larger countries:
Bolivia, Argentina, and Brazil
fig. 1). The northwestern
boundary with Bolivia, extending through the low hills of the Chaco
region, was set in 1938. The boundary between the Chaco and Brazil
was defined in 1927; it continues from the confluence of the Río
Apa and Río Paraguay northward along the course of the Río Paraguay
to the border with Bolivia. The northern border of the Paraneña
region, set in 1872, follows the course of the Río Paraná, the
ridges of the mountains in the northeast region, and finally the
course of the Río Apa until it empties into the Río Paraguay.
Paraguay's southern border with Argentina is formed by the Río
Pilcomayo, Río Paraguay, and Río Paraná. These boundaries were
agreed to in 1876.
Data as of December 1988