Where in the world?
The flag of Mexico has three vertical stripes of green, white, and red, with the national coat of arms centered in the white stripe.

Mexico

México

Population: 128,932,753

Region: Americas

Subregion: North America

Capital: Mexico City

Top Level Domain: .mx

Currencies: Mexican peso

Border countries

The flag of Belize has a blue field with a red border and a white disc in the center featuring the national coat of arms.

Belize

Population: 397,621

Region: Americas

Capital: Belmopan
The flag of Guatemala has three vertical stripes of blue, white, and blue, with the national emblem in the center of the white stripe.

Guatemala

Population: 16,858,333

Region: Americas

Capital: Guatemala City
The flag of the United States has thirteen horizontal stripes of red and white with a blue rectangle in the top left corner containing fifty white stars.

United States of America

Population: 329,484,123

Region: Americas

Capital: Washington, D.C.