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: République du Congo
Population: 5,657,000
Region: Africa
Sub Region: Middle Africa
Capital: Brazzaville
Top Level Domain: .cg
Currencies: Central African CFA franc
Languages: French
Border Countries: AGOCMRCAFCODGAB