This book focuses on spatial planning of megacities that are growing in Asia, Africa, and America. These cities are not be seen in isolation from their respective influence regions. They complement each other. Most of the solutions to the problems of such cities are found in their respective regions, and, on the other hand, the regions derive their strength from their respective megacities. There is a need for promoting integrated spatial planning of megacity regions. The five chapters in this book highlight the spatial planning of such regions.