I bought this for the maps. I originally borrowed it from the library to aid me with my research...recent and comprehensive world maps of seagrass distribution are not that easy to come by and this book includes one for every imaginable species. It was so useful that I decided I wanted to always have it on hand. In the text it gives nice descriptions of seagrass composition for different areas of the world and in the back has drawings, distribution maps, and estimated coverage of each species. The only thing I wished it included is standard characteristics of each species in the back. This book pulls together information from a remarkable number of sources into one place and ended up saving me a lot of time and headaches.