Whistling Cay is a islet, situated west of Mary Point on Saint John in the United States Virgin Islands. It is covered with trees and high cliffs in the north, where it reaches a elevation. A gravel beach is located on the southeast side of the island. It is separated from Saint John by the Fungi Passage, which has a depth of .Griffes, Peter L. (2004). 2004 Atlantic Boating Almanac: Gulf of Mexico. ProStar Publications. Page 536. .
Whistling Cay can be reached by boat or kayak from Cinnamon Bay, Maho Bay, or Francis BayPotter, Susanna Henighan (2013). Virgin Islands. Avalon Travel. Page 93. . and it is a popular destination for scuba diving and snorkeling.Miller, Courtney (2008). The Rough Guide to the Caribbean. Penguin. Page 422. . During the 19th century, customs officials stationed on the islet would stop and inspect boats plying the passage between the British Virgin Islands and the then Danish Virgin Islands.National Geographic Society (1992). National Geographic's Guide to the National Parks of the United States. Page 92. . It is located within the Virgin Islands National Park.
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