Japanese island Okinawa's on a Jewish mosaic displayed occasionally (3,4)

I believe the answer is:

iwo jima

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'japanese island' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

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

I've seen this clue in The Independent.

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