Located between the Pacific and Indian Oceans, and between the Asian and Australian continents, the seas of the Indonesian Archipelago have a significant role in global weather patterns and oceanic circulation. The dynamic interplay between geological, physical, chemical, and biological processes, past and present, has given rise to one of the most diverse marine regions on the planet. Using maps and numerous illustrations, This text describes the complex coastal and marine ecosystems of the region in detail. Discussion of development, resource use and ecologically sustainable management plans is also incorporated.