Acadiana is the name given to the traditional twenty-two parish Cajun homeland, which in 1971 the Louisiana state legislature officially recognized for its unique Cajun and Acadian heritage (per House Concurrent Resolution No. 496). Despite the frequent association of Cajuns with swamplands, Acadiana actually consists of prairies, marshes, and wooded river (or bayou) lands. Acadiana often is applied only to Lafayette Parish and several neighboring parishes, usually Acadia, Iberia, St. Landry, St. Martin, and Vermilion parishes, and sometimes also Evangeline and St. Mary; this eight-parish area, however, is actually the "Cajun Heartland, USA" district, which makes up only about a third of the entire Acadiana region.
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