Flag of Tonga

Tonga
Use	Civil and state flag, civil and state ensign
Proportion	1:2
Adopted	4 November 1875
Design	A red field with the white rectangle on the upper hoist-side corner bearing the red Greek Cross in the centre.
Naval Ensign of Tonga
Use	Naval ensign
Proportion	1:2
Royal Standard of Tonga
Use	Royal standard
Proportion	39:55

The flag of Tonga consists of a red field with a white canton charged with a red couped cross. Adopted in 1875 after being officially enshrined into the nation's constitution, it has been the flag of the Kingdom of Tonga since that year. The constitution stipulates that the national flag can never be changed.