The book Regional Geography of the World by Dr. Ali Hassan Moussa, and this book is a serious academic scientific study, in which the author defined the concept of the region and the bases for defining it, the environment and the mutual influences between them and man, with a regional study of the units of the earth's surface, based on the differences that exist between the major units, and within the same units, the book includes one hundred and eighteen figures and pictures that help to realize the truth closely, rather than occupying the imagination, and these figures may even dispense with the use of an atlas.