Where in the world?
The flag of Kuwait has three horizontal stripes of green, white, and red, with a black trapezoid on the hoist side.

Kuwait

الكويت

Population: 4,270,563

Region: Asia

Subregion: Western Asia

Capital: Kuwait City

Top Level Domain: .kw

Currencies: Kuwaiti dinar

Border countries

The flag of Iraq has three horizontal stripes of red, white, and black, with three green stars in the center of the white stripe.

Iraq

Population: 40,222,503

Region: Asia

Capital: Baghdad
The flag of Saudi Arabia has a green field with white Arabic inscription and a sword.

Saudi Arabia

Population: 34,813,867

Region: Asia

Capital: Riyadh