This is the fourth edition of the premier book on wetland ecology and management.  As attested to by the reviews, this book is the single most important book on wetlands, and has educated a generation of ecologists, land use planners and water resource managers worldwide.  This new edition answers the market's request for a smaller, more streamlined book by moving 7 wetland-types chapters to a support website, and integrating the core concepts from these chapters better throughout the book.  This will bring the book to a size more manageable for a one semester course, and better align the book with the way the course is actually taught.