Where in the world?
The flag of Mali has three vertical stripes of green, yellow, and red.

Mali

Population: 20,250,834

Region: Africa

Subregion: Western Africa

Capital: Bamako

Top Level Domain: .ml

Currencies: West African CFA franc

Border countries

The flag of Algeria has two vertical bands of green and white, with a red crescent and star centered over the boundary between the colors.

Algeria

Population: 44,700,000

Region: Africa

Capital: Algiers
The flag of Burkina Faso has two horizontal stripes of red and green with a yellow five-pointed star in the center.

Burkina Faso

Population: 20,903,278

Region: Africa

Capital: Ouagadougou
The flag of Guinea has three vertical stripes of red, yellow, and green.

Guinea

Population: 13,132,792

Region: Africa

Capital: Conakry
The flag of Ivory Coast has three vertical stripes of orange, white, and green.

Ivory Coast

Population: 26,378,275

Region: Africa

Capital: Yamoussoukro
The flag of Mauritania has a green field with a gold star and crescent in the center, and two red stripes at the top and bottom.

Mauritania

Population: 4,649,660

Region: Africa

Capital: Nouakchott
The flag of Niger has three horizontal stripes of orange, white, and green with an orange circle in the center.

Niger

Population: 24,206,636

Region: Africa

Capital: Niamey
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