In the revised and expanded edition of this classic guide, Ralph W. Tiner introduces readers to the ecology and beauty of the wetlands in eastern North America. Topics include their formation and functions, wetland types, causes of loss and degradation, and recent efforts to protect them. The discussion now includes many examples from the Great Lakes region and information on best management practices for working in and around wetlands, including vernal pools. A new chapter on classification and assessment further clarifies how the unique characteristics of these important natural resources serve specific functions.