The Grisons is the only trilingual canton of Switzerland. It is also the only one where Romansh, Switzerland's fourth national language, has official status. Romansh language and culture is an important part of local identity. In the canton had a population of . It is the least densely populated canton of Switzerland. The only large city in the canton is Chur, with the majority of the population living in mountainous areas, including some of the highest valleys in Europe. The canton is a major tourist destination year-round, particularly for winter sports, and comprehends a large number of Alpine resort towns, notably Davos and St. Moritz. The canton is also renowned for its extensive narrow-gauge railway network, operated by the Rhaetian Railway.