Where in the world?
The flag of Sudan is composed of three equal horizontal bands of red, white and black, with a green isosceles triangle superimposed on the hoist side. The green triangle spans about two-fifth the width of the field with its base on the hoist end.

Sudan

Native Name: السودان

Population: 51,662,000

Region: Africa

Sub Region: Northern Africa

Capital: Khartoum

Currencies: Sudanese pound

Top Level Domain: .sd

Languages: Arabic, English

Border Countries: EthiopiaEgyptEritreaLibyaSouth SudanChadCentral African Republic