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This textbook delves deeply into the geomorphological processes that have sculpted the landscapes of Southeast Asia, particularly those found in the tropical and subtropical zones. It begins with a comprehensive overview of landforms, from macro to micro scales, and moves into more specialized topics such as mountain formation, volcanic activity, river systems, coastal dynamics, and submarine geomorphology. Each chapter combines theoretical foundations with practical case studies to illustrate the complex interplay of endogenic and exogenic forces, and their impact on the region