This is already answered in the FAQ.
"We make every effort to reach you wherever you are, whenever possible. Items cannot be shipped to countries on the list of US Treasury Department’s Sanctions Programs and the following countries: Pakistan, Bangladesh, Iraq, Iran, North Korea, Crimea, Cuba, Sevastopol city and Syria. Each challenge includes details about prizes and shipping availability, as this list may change at any time (locations may be added or removed based on unforeseen events). If you’re in one of these countries, you are welcome to participate within the Terms of Service. You may decline a prize, select an address in a country where shipping is available, or consider charitable options instead."
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