Where in the world?
The flag of Chile has three horizontal stripes of red, white, and blue with a white star in the center of the blue stripe.

Chile

Population: 19,116,209

Region: Americas

Subregion: South America

Capital: Santiago

Top Level Domain: .cl

Currencies: Chilean peso

Border countries

The flag of Argentina has three horizontal bands of light blue, white, and light blue, with a yellow sun in the center of the white band.

Argentina

Population: 45,376,763

Region: Americas

Capital: Buenos Aires
The flag of Bolivia has three horizontal bands of red, yellow, and green with the national coat of arms in the center.

Bolivia (Plurinational State of)

Population: 11,673,029

Region: Americas

Capital: Sucre
The flag of Peru has three vertical stripes of red, white, and red with a national coat of arms in the center of the white stripe.

Peru

Population: 32,971,846

Region: Americas

Capital: Lima