AROSA, a climatic station of Switzerland, situated at a height of 6,000ft. in the high valley of the Plessur, south-east of Chur. Here, among extensive pine forests (remnants of which still shel ter the valley), a small village has existed, with varying pros perity, from the 14th century. The extension of the tourist indus try and the development of winter sports have made it one of the best-known Alpine resorts.