Where in the world?

Github
The flag of South Sudan is composed of three equal horizontal bands of black, red with white top and bottom edges, and green. A blue equilateral triangle which spans about two-fifth the width of the field is superimposed on the hoist side with its base on the hoist end of the field. At the center of this triangle is a five-pointed yellow star.

São Tomé and Príncipe

Native Name: República Democrática do São Tomé e Príncipe
Population: 219,161
Region: Africa
Sub Region: Middle Africa
Capital: São Tomé
Top Level Domain: .st
Currencies: São Tomé and Príncipe dobra
Languages: Portuguese