This full-colour field guide to the marine life of coastal British Columbia, Alaska, Washington, Oregon and northern California is perfect for divers, boaters, beachwalkers and snorkellers of every experience level. The Pacific Northwest is home to more than 7,000 species of invertebrates, fishes, marine mammals and marine plants. This concise handbook is a ready reference to the 420 most common species that can be observed and identified without being disturbed.