Jaguarão River

[1] It forms the border between Uruguay and Rio Grande do Sul state in southernmost Brazil.

The river originates in Serras de Sudeste (Southeastern Mountain Ranges) and flows east to empty into Lagoa Mirim (Portuguese) / Laguna Merín (Spanish), which is a large coastal lagoon, which is indirectly connected to the Atlantic Ocean.

Regarding its navigability, vessels sailing on the nearby Mirim Lagoon are by treaty under Brazilian jurisdiction.

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The Baron of Mauá International Bridge over the Jaguarão river, border between Uruguay and Brazil