Alto BiobÃÂo National Reserve is a nature reserve located in the easternmost portion of Upper BÃÂo-BÃÂo River basin, in the La AraucanÃÂa Region, Chile. The vegetation is dominated by Andean steppe with scattered Araucaria trees.
Alto BiobÃÂo National Reserve is part of the Araucarias Biosphere Reserve.
The reserve is crossed by the route that connects Chile and Argentina via Pino Hachado Pass.