High Quality Content by WIKIPEDIA articles! Tryon Island is a coral cay located in the southern Great Barrier Reef, 86 km northeast of Gladstone, Queensland, Australia, and 465 km north of the state capital Brisbane. The island is a protected area and forms part of Capricornia Cays National Park. It is part of the Capricornia Cays Important Bird Area. The cay covers an area of 0.45 square kilometres and is surrounded by a coral reef that is partially exposed at low-tide.