This map focuses on the extensive river system in southeastern South America, beginning at the Rio de la Plata and extending through the Uruguay and Parana Rivers. There is meticulous detail of all the various rivers, tributaries, and lakes in the region, as well as numerous depth soundings at the mouth of the Rio de la Plata. The map also depicts the change in boundary lines between the Spanish and Portuguese territories from 1777 to the date of publication, with the 1777 boundary denoted by a yellow dotted-and-dashed line, and the current boundary denoted by a red line. The green areas surrounding the Laguna Merim are neutral.

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Condition: B+

Original color on watermarked paper with a few short centerfold separations that have been archivally repaired and a faint damp stain along centerfold at right. There are a few short tears in blank margins that have also been archivally repaired, one of which enters 1.5" into map at left.