Where in the world?
The flag of Benin has two horizontal bands of yellow and red with a green vertical band on the hoist side.

Benin

Bénin

Population: 12,123,198

Region: Africa

Subregion: Western Africa

Capital: Porto-Novo

Top Level Domain: .bj

Currencies: West African CFA franc

Border countries

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 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 Nigeria has three vertical stripes of green, white, and green.

Nigeria

Population: 206,139,587

Region: Africa

Capital: Abuja
The flag of Togo has five horizontal stripes of green and yellow with a red square in the top left corner containing a white star.

Togo

Population: 8,278,737

Region: Africa

Capital: Lomé