Where in the world?
The flag of Vietnam features a large five-pointed yellow star on a red field.

Vietnam

Native Name: Cộng hòa xã hội chủ nghĩa Việt Nam
Population: 101,343,800
Region: Asia
Sub Region: South-Eastern Asia
Capital: Hanoi
Top Level Domain: .vn
Currencies: Vietnamese đồng
Languages: Vietnamese
Border Countries: KHMCHNLAO