The Biosphere Reserve Großes Walsertal (German: Biosphärenpark Großes Walsertal) is a protected nature reserve in the Austrian state of Vorarlberg. The area of the nature reserve covers 19,231 ha. There are 3,420 inhabitants and around 180 farms (42 % of which are organic). The reserve strives for a sustainable economy and tourism in the region and provides a platform for discussion about society, politics and science. The Biosphere Reserve Großes Walsertal has been a UNESCO biosphere reserve since November 2000.