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census data is captured. DAs cover the entirety of Canada and follow the
boundaries of census subdivisions and census tracts. While inter-census
geographic stability is not guaranteed, they generally tend to be as
stable as the census tracts and census subdivisions that they make up.
In addition to census boundaries, DAs will generally follow natural
boundaries created by other spatial features like roads, railways, water
features, and designed to be spatially compact and with a target
population around 4