Forestier Peninsula, peninsula in southeastern Tasmania, Australia, measuring 12 by 9 miles (19 by 14 km) and bounded by the Tasman Sea (east) and by Norfolk Bay (west). To the north the promontory is connected to the mainland by a short isthmus, and to the south it is linked to the Tasman Peninsula by the 1/4-mile-wide Eaglehawk Neck.

The latter feature provided the only land route to freedom for the prisoners at the Port Arthur penal colony, and guard dogs chained together across the width of Eaglehawk Neck were used to discourage escapees. Among the notable landforms of Forestier Peninsula is a 10-acre (4-hectare) area of “tessellated pavement,” which was declared a State Reserve in 1966.

Tasman Peninsula, peninsula in southeastern Tasmania, Australia, connected to the Forestier Peninsula to the north by a narrow isthmus, Eaglehawk Neck. Measuring 17 by 12 miles (27 by 19 km) and occupying 200 square miles (520 square km), the peninsula comprises three arms bounded by Storm Bay (west), Norfolk Bay (north), and the Tasman Sea. Its heavily wooded hills rise to more than 1,500 feet (460 m). The coastline is very much embayed and eroded into sea cliffs, stacks (isolated, vertical rock formations), and blowholes, into which waves rush to form fountains on the shore.

The peninsula was explored by the Dutch navigator Abel Tasman in 1642. Not until 1830, however, was a settlement, a penal colony at Port Arthur on the south coast, established. The partially restored ruins of the colony are now a tourist attraction. Several small resort towns and the local fruit orchards and sheep farms are linked to Hobart (60 miles [100 km] west) by the Arthur Highway. The entire peninsula has been registered as part of Australia’s National Estate (places preserved as part of Australia’s national heritage).

This article was most recently revised and updated by Michael Ray.