Two thousand miles of river wind through the interior of South America connecting one of the world's largest remaining wetlands to the sea. The political leaders of Brazil, Argentina, Uruguay, Paraguay and Bolivia have agreed to design a way for more commerce to flourish along the rocky shoals of the Parana and Paraguay rivers against the wishes of a coalition of 300 indigenous and environmental groups who want to preserve their ways of life. Producer Bob Carty talks with presidents and chiefs, as well as river captains and biologists, who all have a stake in the future of the 'hidrovia' -- which means 'waterway' in both Spanish and Portuguese.