Isthmus

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.

For other uses, see Isthmus (disambiguation).
The sandy isthmus or tombolo "The Neck" connects North and South Bruny Island in Tasmania, Australia.
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