Two young brothers, aged 3 and 5, were allegedly dumped in a Portuguese forest by their parents, who lured them into a fake treasure hunt before blindfolding them thousands of miles from home.

The helpless children were rescued by a passing couple Tuesday night after they were found frantically wandering on a main road in Monte Novo do Sul with backpacks stuffed with clothing and food, according to Portuguese media.

Marine Rousseau, 41, and stepdad Marc Ballabriga, 55, allegedly ditched Barthelemy and Zacharie in the woods under the guise of a treasure hunt.

Chilling CCTV footage shows the mum and stepdad accused of abandoning the two young boys during their 2,000km journey.

The children were later found crying and screaming on a rural road in Portugal on Tuesday evening before the parents were caught in a town about two hours north.