Just 17 miles (27 km) from Kauai, the 73-sq mile (189-sq km) island of Niihau (nee-ee-how) is called  The Forbidden Island  because it is privately owned and cannot be visited without an invitation from one of the 225 inhabitants.
Niihau is located only 17 miles from Kauai. 
mnli hypothesis: Niihau is located only 17 miles from Kauai.  premise: Just 17 miles (27 km) from Kauai, the 73-sq mile (189-sq km) island of Niihau (nee-ee-how) is called  The Forbidden Island  because it is privately owned and cannot be visited without an invitation from one of the 225 inhabitants.