The area forms a water divide, more dramatically at regional flood stage. ==Discovery== In 1744 a Jesuit priest named Father Roman, while ascending the Orinoco River, met some Portuguese slave-traders from the settlements on the Rio Negro.
Charles Marie de La Condamine, seven months later, was able to give to the Académie française an account of Father Roman's voyage, and thus confirm the existence of this waterway, first reported by Father Acuña in 1639. Little credence was given to Father Roman's statement until it was verified, in 1756, by the Spanish Boundary-line Commission of José Yturriaga and Solano.
In 1800 German scientist Alexander von Humboldt and French botanist Aimé Bonpland explored the river.
During a 1924–25 expedition, Alexander H.
In 1968 the Casiquiare was navigated by an SRN6 hovercraft during a National Geographic expedition. ==Geography== The origin of the Casiquiare, at the River Orinoco, is below the mission of La Esmeralda at , and about above sea level.
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