Although not technically a cannibal movie (the main tribe are 'head-hunters'; cannibals feature very briefly but no cannibalism is shown), Amazonia shares enough similarities with the infamous gut-munching gore classics of the 70s and 80s to be considered part of the genre.
Catherine Miles (Elvire Audray) is a beautiful 18-year old taken captive by a group of savages after her parents are killed on a river trip. Sold to a member of the tribe for the sum of 'a goose, a water-dog and a turtle', Catherine endures terrible suffering until she is helped by Umukai, a warrior who treats her with a bit of respect. After many months spurning Umukai, believing that he was the one who killed her mum and dad, she discovers that others were in fact responsible. Falling in love with her friendly native hunk, she convinces him to help her take revenge on those really responsible.
Amazonia is pretty close in theme to The Man From Deep River, Umberto Lenzi's classic from 1972, but doesn't quite match that one in terms of quality. However, with a fair amount of cheesy gore (several be-headings, blow-darts in the face, some bloody bullet wounds) and loads of female nudity (courtesy of Audray and the native women, some of whom are pretty foxy), fans of this kind of thing should find just about enough to enjoy in this flick to make it worth a watch.