Mount Suribachi's summit is the highest point of this island (3,4)

I believe the answer is:

iwo jima

(Other definitions for iwo jima that I've seen before include "site for WWII battle" , "Second World War battle island" , "Battleground" , "Largest of the Japanese Volcano Islands, heavily fortified in World War II" , "fierce battle" .)

I've seen this clue in The Times.

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