Sultanate on the Arabian Peninsula (4)

I believe the answer is:

oman

(Other definitions for oman that I've seen before include "Former Gulf country, Muscat and --" , "Gulf state" , "Sultanate on the south-east coast of the Arabian Peninsula" , "Nation" , "Arabian country, capital Muscat" .)

I've seen this clue in The Irish Times and The Wall Street Journal.

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