Where in the world?
The flag of American Samoa features a large white triangle edged in red that is based on the fly side and extends to the hoist side and is charged with an eagle, all on a blue field.

American Samoa

Native name: American SamoaPopulation: 49,710Region: OceaniaSub region: PolynesiaCapital: Pago PagoTop level domain: .asCurrencies: United States dollarLanguages: English, Samoan