Directed by Ruggero Deodato (Later responsible for bringing us all Cannibal Holocaust) Lost Cannibal World aslo known as Ultimo Mondo Cannibale follows the misfortunes of a group of prospectors who's plane goes down in the jungle. Not sure exactly where they went down (possibly Indonesia / PNG / Phillipinnes) but either way they find themselves in a world of pain when they realise they've gone down in a jungle inhabited by cannibals. The groups pilot and assistant are killed by natives and remaining members are captured by the natives.
Shot in the same style of the Cannibal movies at the time this is raw and confronting and the gore is very realistic. All in all a cool watch and is more or less a precursor to the Cannibal Holocaust movie, and has a very similar feel, and would appeal to the same crowd of people.
Someone has been kind enough to upload the entire movie onto Youtube so for your viewing pleasure here's the full version!