Calgary is the largest city in the Province of Alberta, Canada. It is located in the south of the province, in an area of foothills and prairie, approximately 80km (50mi) east of the front ranges of the Canadian Rockies. The city is located in the Grassland region of Alberta. Calgary is well-known as a destination for winter sports and ecotourism with a number of major mountain resorts near the city and metropolitan area. Economic activity in Calgary is mostly centered on the petroleum industry. Agriculture, tourism and high-tech industries also contribute to the city's economic growth. In 1988, Calgary became the first Canadian city to host the Olympic Winter Games.