Key points are not available for this paper at this time.
Critical environmental regions - concepts, distinctions and issues Amazonia the Aral Sea basin the Nepal middle mountains the Ukambani region of Kenya the Llano Estacado of the American Southern High Plains the Basin of Mexico the North Sea the Ordos Plateau of China the eastern Sunderland region of South-East Asia comparisons and conclusions.
McNicoll et al. (1996) studied this question.