Sri Lanka is surrounded by numerous underwater reef habitats that sustain a wealth of marine biodiversity. However, many of these habitats and the animals that live in them remain unknown and under appreciated by a vast majority of Sri Lankans. This book provides an introduction to the coral and rocky reefs around Sri Lanka, with descriptions of different reef types and distribution in Sri Lanka, and information on basic reef ecology. It also provides information on animal behavior, marine conservation and other interesting aspects of the marine environment. The text is illustrated throughout with color photographs taken underwater in Sri Lanka. The book also brings to light the threats faced by these fragile ecosystems and highlights the need to conserve and manage what is an important part of Sri Lankas natural heritage.