For years, activists lobbied to save what they call Europe's last major "wild river" -- one whose course is unaltered by industry or dams -- recruiting A-listers like Leonardo DiCaprio to their cause. "It establishes, for the first time, a conservation concept where an entire river system is protected and not just individual sections of a river," said Ulrich Eichelmann, head of the Austria-based advocacy organisation RiverWatch.