Ecoregions applies the principles described in Bailey's Ecosystem Geography to describe and characterize the major terrestrial and aquatic ecological zones of the Earth. Robert Bailey's system for classifying ecoregions has had a major influence, and has been adopted by major organizations such as the US Forest Service and The Nature Conservancy. This book includes numerous photographs of representative ecoregions, and outstanding color figures are complemented by two full-color maps showing the major ecoregions of the continents and of the oceans.