Bettmeralp, Valais (Switzerland) - "Aletsch-Halbmarathon". The 21.1 km long challenging run through the Unesco World Heritage Site. The views of the Great Aletsch Glacier and the four thousand metre peaks of the Valais region are what make the Aletsch Half-Marathon the most beautiful mountain run in Europe, attracting up to 2,700 runners from all over Switzerland and abroad every year. www.aletsch-halbmarathon.ch