Capital Cities

What Middle Eastern country has Muscat as its capital and uses the rial as its currency?

More Questions from Capital Cities
Which of these continent - country - capital groups is correct?
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What is the only national capital to lie on the Dnieper River?
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What is the capital of Colombia and the country's largest city?
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What is the capital of Croatia?
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In the capital city Washington D.C., what building would you find there?
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What are, respectively, the capital cities of England, Ireland, Scotland and Wales?
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Tarawa is the capital of which country?
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Port-Vila is the capital of what country?
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