Information about skiing and ski holidays Grosses Walsertal: Set off on a journey to find the answers to these questions and much more! Discover the Biosphere Reserve in Grosses Walsertal! The people who work and live in this calm, romantically wild mountain valley are innovative and yet conscious of their traditions – and they consider the interaction between society, the economy, ecology and culture. This has helped the valley to gain, among other accolades, a UNESCO seal of approval for the “Biosphere Reserve”.