1988 film by Alain Fresnot

Anna, an Italian woman, approaches Shankar, an explorer, to accompany her in search of the golden city of El Dorado. He accepts the offer and sets out on an adventure through the Amazon.

While filming a TV special about dolphins in Mexico, Eliana meets a biologist who warns her of an ecological danger, since the greedy Esquivel has stolen a crystal skull from the deep waters of the ocean. That's the start of a great adventure and a romance with the dolphin trainer.