Author 1: Aiken, S. Robert Author 2: Leigh, Colin H. By 1990 a conurbation will have emerged in the Kiang Valley of Peninsular Malaysia with a probable population of more than two million people. Rapid urban growth has already generated physical and social problems. Soil erosion and flooding have increased, and health problems have been created. The persistence of slums and squatter settlements detracts from the quality of urban life.