tourist centre in the summer and a ski resort in the winter. There are 78 communes in the province and Sondrio is the biggest town and the administrative centre. The Stelvio National Park is located in the north-eastern end of the province. The economy is based on construction, logging, quarrying, tourism and light industry. Workers from Switzerland commute to work in Sondrio, and other workers cross the border from Italy to join the Swiss workforce. Throughout the province grapes have traditionally been grown, each district having its own local variety and producing its own local wine. It has been necessary for farmers to engineer terraces on the steep slopes, building dry stone retaining walls and moving earth to make the best use of terrain that is unsuitable for general agricultural purposes. The traditions of viticulture are embedded in the culture of the countryside. See also Bacino di San Giacomo References External links Official website Sondrio Sondrio