Northumberland Islands National Park, Nature reserve in Mackay Regional, Australia.

Northumberland Islands National Park spreads across several continental islands off Queensland's eastern coast with diverse ocean and land habitats. The island groups display different marine features and hold forest, beach, and coral habitats.

James Cook reached the Northumberland Islands in 1770 during his first voyage to the South Seas and named them after Hugh Percy, 1st Duke of Northumberland. The national park itself was established on 23 June 2000 and covers 17.2 square kilometres within the Great Barrier Reef World Heritage Area.

The islands hold important Aboriginal sites showing how local people have fished and gathered resources here for generations. These places tell a story of a long connection between communities and the ocean.

To visit the islands, you need to arrange a boat trip since there are no land connections and transport options are limited. It is wise to bring your own supplies as shops and facilities are rarely found on the islands.

The park covers 17.2 square kilometres within the Great Barrier Reef World Heritage Area. Its islands are continental in origin, unlike the coral cays of the reef 60 km to the east. Prudhoe Island, four kilometres long, holds the park's highest point at 320 metres.