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Franciscana dolphins, Pontoporia blainvillei, are endemic to the west coast of Brazil, Uruguay and Argentina. They range from Itaunas, Espirito Santo, Brazil to Golfo Nuevi, Peninsula Valdes, Argentina. They are also found in estuaries, such as the La Plata River and Babitonga Bay. There are distinct gaps in their distribution between Ubatub and Macae and also between Barra de Itabapoana and Regencia. Franciscana dolphins may have a seasonal distribution in Babitonga Bay, where dolphins are found farther from the coast in winter. There are north and south genetic stocks of dolphins with a geographical boundary at Mostardas.
Biogeographic Regions: neotropical (Native )