The 125-mile (200km) road would pass through the Alto Purús national park in Peru, connecting a remote area to the outside world but opening up the most biologically and culturally important area of the upper Amazon to logging, mining and drug trafficking. Opponents of the plan fear it will threaten the existence of uncontacted tribes such as the Mashco-Piro. The first detailed photographs of members of the tribe made headlines around the world earlier this year after they were spotted on a riverbank.