<P> The concept "natural region" may refer to a small, well defined area, or to a large basic geographical unit, like the vast boreal forest region . The term may also be used generically, like in alpine tundra, or specifically to refer to a particular place . </P> <P> The term is particularly useful where there is no corresponding or coterminous official region . The Fens of eastern England, the Thai highlands, and the Pays de Bray in Normandy, are examples of this . Others might include regions with particular geological characteristics, like badlands, such as the Bardenas Reales, an upland massif of acidic rock, or The Burren, in Ireland . </P>

Introduction of the natural regions of the world