Where in the world?
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

Subregion: Southern Africa

Capital: Mbabane

Top Level Domain: .sz

Currencies: Swazi lilangeni

Border countries

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 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

Capital: Pretoria