A natural region is a basic geographic unit. Usually it is a region which is distinguished by its common natural features of geography, geology, and climate. From the ecological point of view, the naturally occurring flora and fauna of the region are likely to be influenced by its geographical and geological factors, such as soil and water availab...
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http://en.wikipedia.org/wiki/Natural_region
A geographic area in Alberta delineated as part of an ecological site classification and possessing a distinctive combination of physical features (climate, geology, soils, hydrology) and biological features (plant and animal species, vegetation communities). Alberta is subdivided into six Natural Regions which are
Found on
https://www.encyclo.co.uk/local/22463
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