This book draws its material from recent research and expeditions to the Baleh region. The rich illustrations reveal the breathtaking beauty of its landscape and its biodiversity for future visitors, be they researchers, administrators, students, or perhaps the daring naturalist. The geology chapter lays the foundation to the living diversity to be enumerated, with an account of the rugged and sometimes dangerous rivers and hidden rapids. The plant component showcases the unique orchids, rattans and the tree flora diversity. The zoological aspects of this book covers an array of taxa, both invertebrates (butterflies, dragonflies and stream macrofauna) and vertebrates (fishes, amphibians, reptiles, birds and mammals).