Paraguay is bounded by three substantially larger countries: Bolivia, Argentina, and Brazil (see 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

NOTE: The information regarding Paraguay on this page is re-published from The Library of Congress Country Studies and the CIA World Factbook. No claims are made regarding the accuracy of Paraguay External Boundaries information contained here. All suggestions for corrections of any errors about Paraguay External Boundaries should be addressed to the Library of Congress and the CIA.