Where in the world?
The flag of South Africa has a horizontal bicolor of red and blue with a green Y-shaped band edged in white and a black triangle on the left side.

South Africa

Population: 59,308,690

Region: Africa

Subregion: Southern Africa

Capital: Pretoria

Top Level Domain: .za

Currencies: South African rand

Border countries

The flag of Botswana has a light blue field with a black horizontal stripe bordered by white in the center.

Botswana

Population: 2,351,625

Region: Africa

Capital: Gaborone
The flag of Lesotho has a blue, white, and green horizontal tricolor with a black Basotho hat in the center.

Lesotho

Population: 2,142,252

Region: Africa

Capital: Maseru
The flag of Mozambique has a horizontal tricolor of green, black, and yellow with white fimbriations, and a red triangle at the hoist containing a yellow star with a book and an AK-47 rifle.

Mozambique

Population: 31,255,435

Region: Africa

Capital: Maputo
The flag of Namibia has a diagonal tricolor of blue, red, and green with white fimbriations, and a gold sun with 12 triangular rays in the canton.

Namibia

Population: 2,540,916

Region: Africa

Capital: Windhoek
The flag of Swaziland has a blue field with a white cross and a red cross inside the white cross.

Swaziland

Population: 1,160,164

Region: Africa

Capital: Mbabane
The flag of Zimbabwe has seven even horizontal stripes of green, gold, red, and black with a white triangle containing a red five-pointed star with a Zimbabwe Bird.

Zimbabwe

Population: 14,862,927

Region: Africa

Capital: Harare