You know what it looks like… but what is it called?
TAKE THE QUIZ“intracoastal waterway”
The following 2 entries include the term intracoastal waterway.
Atlantic Intracoastal Waterway
geographical namesystem of inland waterways stretching along the Atlantic coast of the U.S. between Cape Cod and Florida Bay
Gulf Intracoastal Waterway
geographical namesystem of inland waterways stretching 1100 miles (1770 kilometers) along the Gulf of Mexico between northern Florida and southern Texas
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Merriam-Webster unabridged