Um link na página Programa de Isenção de Vistos (em " Viagens ao Canadá, México ou ilhas vizinhas ") aponta para o Closed Loop Voyages página do CBP. De acordo com esta página, as definições de Territórios Contíguos e Ilhas Adjacentes são:
Contiguous Territories are any country sharing a common boundary with the United States. Canada and Mexico are contiguous to the United States.
Adjacent Islands as follows: Anguilla, Antigua, Aruba, Bahamas, Barbados, Barbuda, Bermuda, Bonaire, British Virgin Islands, Cayman Islands, Cuba, Curacao, Dominica, the Dominican Republic, Grenada, Guadeloupe, Haiti, Jamaica, Marie-Galantine, Martinique, Miquelon, Montserrat, Saba, Saint Barthelemy, Saint Christopher, Saint Eustatius, Saint Kitts-Nevis, Saint Lucia, Saint Maarten, Saint Martin, Saint Pierre, Saint Vincent and Grenadines, Trinidad and Tobago, Turks and Caicos Islands, and other British, French and Netherlands territory or possessions bordering on the Caribbean Sea.