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The Great Loop is the continuous waterway that encompasses the eastern portion of North America - including the Atlantic and Gulf Intracoastal Waterways, the Great Lakes, the Canadian Heritage Canals, and the inland rivers of America's heartland. It is considered one of the safest long distance cruising routes in the world. To travel all or a portion of the Great Loop or any of its magnificent side trips is truly an adventure of a lifetime.
from: http://ezinearticles.com/?Americas-Great-Loop-is-an-American-Tradition-For-Boaters&id=2804901