Where in the world?
The flag of the Cook Islands is blue with the UK flag in the canton and a large circle of 15 white five-pointed stars centered in the fly.

Cook Islands

Native name: Cook IslandsPopulation: 15,040Region: OceaniaSub region: PolynesiaCapital: AvaruaTop level domain: .ckCurrencies: Cook Islands dollar, New Zealand dollarLanguages: English, Cook Islands Māori