An isthmus (/ˈɪsməs, ˈɪsθməs/;[1] PL isthmuses or isthmi; from Ancient Greek ἰσθμός (isthmós) 'neck')[2] is a narrow piece of land connecting two larger areas across an expanse of water by which they are otherwise separated.[3] A tombolo is an isthmus that consists of a spit or bar, and a strait is the sea counterpart of an isthmus, being a narrow stretch of sea between two landmasses that connects two larger bodies of water.

The sandy isthmus or tombolo "The Neck" connects North and South Bruny Island in Tasmania, Australia.

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