Macquarie Island is a large island in the Southern Ocean. It is about 1,500 km (932 mi) south east of Tasmania, and about half way between Australia and Antarctica. The island became a UNESCOWorld Heritage Site in 1992. Macquarie Island is about 34 km (21 mi) long and 5 km (3 mi) wide. It was first discovered in July 1810, by Captain Hasselburgh, who was searching for places to hunt whales and seals. No people live there now. The only way to get to the island is by sea and there are no harbors to dock a ship.
Geology
The island was formed by two tectonic plates meeting and forcing each other upwards. It is the only place on Earth where rocks from the Earth's mantle, 6 km (4 mi) below the ocean floor, are being pushed up above sea level. Confirmation is in this reference under section "Criterion (viii)".[1]