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isthmus (noun) a narrow piece of land with water on both sides and connecting two larger areas of land.
The neck of land connecting two larger areas of land with water on either side of it is an isthmus. There is the Panama isthmus joining two areas of land with the Pacific on one side and the Atlantic on the other.
- An isthmus is narrow enough for us to make a water way, by digging a canal across it.
- The isthmus of the two rivers supplies enough irrigation water to the agriculture there.