Where in the world?
The flag of Gambia has three horizontal stripes of red, blue, and green, separated by thin white stripes.

Gambia

Population: 2,416,664

Region: Africa

Subregion: Western Africa

Capital: Banjul

Top Level Domain: .gm

Currencies: Gambian dalasi

Border countries

The flag of Senegal has a green, yellow, and red vertical tricolor with a green star in the center.

Senegal

Population: 16,743,930

Region: Africa

Capital: Dakar