Macquarie Island is a sub-Antarctic island located in the Southern Ocean, situated between New Zealand and Antarctica. It is part of the Tasmanian Wilderness World Heritage Area and is known for its unique geological features, including being the only place on Earth where rocks from the Earth's mantle are exposed at the surface. The island is approximately 34 kilometers long and 5 kilometers wide. The island is home to diverse wildlife, including large populations of penguins, seals, and various seabirds. It is also a significant site for scientific research, particularly in the fields of climate change and marine biology. Macquarie Island is managed by Parks Australia and is a designated nature reserve.