Saint John is one of the Virgin Islands in the Caribbean Sea and a constituent district of the United States Virgin Islands, an unincorporated territory of the United States. Wikipedia
The U.S. Virgin Islands are a group of Caribbean islands and islets. A U.S. territory, it's known for white-sand beaches, reefs and verdant hills. St. Thomas island is home to the capital, Charlotte Amalie. To the east is the island of St. John, most of which comprises Virgin Islands National Park. St. Croix island and its historic towns, Christiansted and Frederiksted, are to the south.