Where in the world?
The flag of Puerto Rico has five equal horizontal bands of red alternating with white. A blue isosceles triangle based on the hoist side has a large five-pointed white star in the center.

Puerto Rico

Native Name: Commonwealth of Puerto Rico
Population: 3,203,295
Region: Americas
Sub Region: Caribbean
Capital: San Juan
Top Level Domain: .pr
Currencies: United States dollar
Languages: English
Border Countries: