An isthmus is a thin strip of land that connects two larger land masses. It has water on both of its sides and is sometimes a tombolo, which is formed from deposits such as sand, gravel, or silt. A tombolo usually connects an island to the mainland.
Australia and New Zealand
- Auckland isthmus links the Northland Peninsula and the rest of New Zealand's North Island.
- The Rongotai isthmus in Wellington, New Zealand is between the Miramar Peninsula and the two suburbs of Kilbirnie and Lyall Bay.
- The Neck in Bruny Island, Tasmania joins North and South Bruny.
- Eaglehawk Neck connects mainland Tasmania with the Tasman Peninsula.
- The Taillefer Isthmus is located in Western Australia.
- East Bay Neck is located in Tasmania.
There are many isthmus examples throughout the world. Although some are made of land and others of more granular particles such as sand, what they all have in common is water on both sides.