The main part of the Zagros range is in Iran. To quote Britannica: "The Zagros range is about 990 miles (1,600 km) long and more than 150 miles (240 km) wide. Situated mostly in what is now Iran, it forms the extreme western boundary of the Iranian plateau, though its foothills to the north and west extend into adjacent countries."
The setters originally gave only Iran as the answer to the question "In which country are the Zagros mountains?" The vetters, having consulted Wikipedia, suggested that Iraq and Turkey should also be allowed.
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