Where in the world?
The flag of Czechia is composed of two equal horizontal bands of white and red, with a blue isosceles triangle superimposed on the hoist side of the field. The triangle has its base on the hoist end and spans about two-fifth the width of the field.

Czech Republic

Native name: CzechiaPopulation: 10,698,896Region: EuropeSub region: Central EuropeCapital: PragueTop level domain: .czCurrencies: Czech korunaLanguages: Czech, Slovak
Border Countries:AustriaGermanyPolandSlovakia