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

Paraguay

Population: 7,132,530

Region: Americas

Subregion: South America

Capital: Asunción

Top Level Domain: .py

Currencies: Paraguayan guaraní

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 Brazil has a green field with a yellow diamond and a blue globe with stars in the center.

Brazil

Population: 212,559,409

Region: Americas

Capital: Brasília