Kong Island (original Italian title: Eva, la Venere selvaggia; translated as Eva, the Savage Venus) is a 1968 jungle adventure film (with a science fiction element) directed by Roberto Mauri (billed as Robert Morris).
Mad scientist Albert Muller is experimenting with small radio transmitters implanted in the brains of gorillas that control their minds.
This is where the final conflict and resolution takes place---a rather convoluted mess that leaves Burt and Diana as the only survivors.
Unlike virtually every other film which features a jungle girl character, this story concentrates on Burt and his love interest Diana, with Eva confined to a marginal supporting role.
Contrary to popular belief, this film has nothing to do with King Kong and does not take place on an island.