Where in the world?
The flag of Qatar has a maroon field, on the hoist side of which is a white vertical band that spans about one-third the width of the field and is separated from the rest of the field by nine adjoining fly-side pointing white isosceles triangles that serve as a serrated line.

Qatar

Native Name: قطر

Population: 3,173,024

Region: Asia

Sub Region: Western Asia

Capital: Doha

Currencies: Qatari riyal

Top Level Domain: .qa

Languages: Arabic

Border Countries: Saudi Arabia