Grande Prairie Fr. gräNd prâ˝rē´ [key], city (1991 pop. 28,271), W Alta., Canada, NW of Edmonton. It is the chief business center for the Peace River valley farming area. The discovery of oil and natural gas in the region in the late 1970s led to a short boom which dramatically increased the city's population. The Northern Winter Carnival is held in the city annually.
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