In·tra·coas·tal Waterway 
(ĭn′trə-kōstəl)
(ĭn′trə-kōstəl) A system of artificial and natural channels and canals along the eastern and southeast coasts of the United States. It includes the Atlantic Intracoastal Waterway and the Gulf Intracoastal Waterway and affords sheltered passage for commercial and pleasure craft.