This is the flag of ...
Tuvalu
Niue
Taiwan
Sakhalin Oblast
On the left of the flag is the actual island of Sakhalin. The smaller islands on the right are the Kuril Islands.
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Answers by country
Tuvalu
Niue
Taiwan
Sakhalin Oblast
answers
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25
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4312
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363
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202
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71
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21
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128
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12
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10
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18