Where in the world?
The flag of the Republic of the Congo features a yellow diagonal band that extends from the lower hoist-side corner to the upper fly-side corner of the field. Above and beneath this band are a green and red triangle respectively.

Republic of the Congo

Native name: Republic of the CongoPopulation: 5,657,000Region: AfricaSub region: Middle AfricaCapital: BrazzavilleTop level domain: .cgCurrencies: Central African CFA francLanguages: French, Kikongo, Lingala
Border Countries:AngolaCameroonCentral African RepublicDR CongoGabon