The Dominion Land Survey is the method used to divide most of Western Canada into one-square-mile sections for agricultural and other purposes. It is based on the layout of the Public Land Survey System used in the United States, but has several differences. The DLS is the dominant survey method in the Prairie provinces, but it is also used in British Columbia along the Railway Belt (near the main line of the Canadian Pacific Railway), and in the Peace River Block in the northeast of the province. The survey was begun July 10, 1871, shortly after Manitoba and the North-West Territories became part of Canada. Covering about 800,000 square kilometres (309,000 sq mi), the survey system and its terminology are deeply ingrained in the rural culture of the Prairies.