Where in the world?
The flag of Tonga has a red field. A white rectangle bearing a red Greek cross is superimposed in the canton.

Tonga

Native Name: Kingdom of Tonga
Population: 105,697
Region: Oceania
Sub Region: Polynesia
Capital: Nuku'alofa
Top Level Domain: .to
Currencies: Tongan paʻanga
Languages: English
Border Countries: