Definition of "Orellana"

But if we shall speake more of rivers, that great floud called by some the river of Amazons, by others Marañon, and by some the river of Orellana, which our Spaniards sailed in their discoveries, ought to blemish all the rest; and, in truth, I am in doubt whither I may tearme it a river or a sea.

1605, Joseph de Acosta, translated by Edward Grimston, History of the Indies

From all the roaring Andes, huge descends / The mighty Orellana.

1727, James Thomson, “Summer”, in The Seasons, London: […] A[ndrew] Millar, and sold by Thomas Cadell, […], published 1768