I believe it's actually called Gurupa, and named after the island on the Amazon just downriver of the delta. The only place I know that refers to the area as Ga

I believe it's actually called Gurupa, and named after the island on the Amazon just downriver of the delta. The only place I know that refers to the area as Garupa is Selfridge's survey at https://www.history.navy.mil/research/library/online-reading-room/title-list-alphabetically/s/survey-amazon-selfrigde.html https://www.history.navy.mil/research/library/online-reading... — and even so inconsistently.