Isle, Biscayne Island, Di Lido Island and Flagler Monument Island. Fisher Island (Miami) Watson Island (Miami) Dodge Island (Miami) Sunset Islands (Miami Beach) - 4 separate, numbered islands Brickell Key (Miami) Illinois Goose Island (Chicago) Northerly Island (Chicago) Kentucky Shippingport, a former town now within the boundaries of Louisville that became an island in 1825 when the Louisville and Portland Canal was built as a bypass of the Falls of the Ohio. Michigan Keweenaw Peninsula, Michigan New Jersey/Delaware Artificial Island, New Jersey (Alloway Township, New Jersey)/a tiny portion of Delaware New York U Thant Island (Manhattan) Hoffman Island (Staten Island) Swinburne Island (Staten Island) Washington Harbor Island (Seattle) Duck Island, in Green Lake Park, Seattle. Wisconsin Door County (north of the canal) Land disconnected by artificial canals Africa has been separated from Eurasia by the Suez Canal Barnegat Peninsula, New Jersey, United States (Point Pleasant Canal) Cape Cod, Massachusetts, United States (Cape Cod Canal) Cape Henlopen, Rehoboth Beach, Delaware, and environs (Lewes and Rehoboth Canal) Cape Island, New Jersey, United States (Cape May Canal) Cijin/Kaohsiung Port, Kaohsiung, Taiwan Delmarva Peninsula, United States (Chesapeake & Delaware Canal; lockless) Western Europe (Rhône–Rhine Canal and rivers) Fenwick Island, Delaware and Maryland, United States (Assawoman Canal) Southern Florida (Okeechobee Waterway) Southeastern New Jersey (Delaware and Raritan Canal) Part of North Carolina (Alligator-Pungo Canal) Peloponnese, Greece (Corinth Canal; lockless) Southern Sweden (Göta Canal and Trollhätte Canal and rivers) Sviyazhsk, Russia Eastern United States and southeastern Canada (Chicago Sanitary and Ship Canal and Chicago River, Mississippi River, Great Lakes, St. Lawrence Seaway) Virginia Beach and Norfolk, Virginia, United States (Albemarle and Chesapeake Canal) Eastern Virginia and North Carolina, United States (Dismal Swamp Canal) Potonggang-guyok, North Korea, between Pothong River and Pothonggang Canal Sääminginsalo, Saimaa, Finland Former hilltops in artificial lakes Barro Colorado Island, a former hilltop in the Panama Canal Zone, Panama René-Levasseur Island, Québec, Canada See also Lists of islands List of unusual drainage systems (where land is isolated by natural two-way drainage) References Artificial