Land with water on two sides, such as Panama (7)

I believe the answer is:

isthmus

(Other definitions for isthmus that I've seen before include "Narrow neck of land joining two larger portions" , "Narrow land bridge" , "Tongue" , "Strip of land connecting larger land masses with water on either side" , "Narrow strip of land joining two larger entities" .)

I've seen this clue in The Irish Times.

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