The flag of Tonga is set on a red field and features a white rectangle in the canton inside which sits a red cross.
The flag of Tonga dates back to 1962 when King George Tupou I, having converted to Christianity, called for the flag of Tonga to symbolise the Christian faith. The original flag was set on a white field with a red cross; however, was deemed to similar to the flag of the Red Cross and thus changed to a red field with the red cross on a white field set in the canton instead.
The flag of Tonga was officially adopted on 4 November 1875. Interestingly, the flag is enshrined in the constitution of Tonga and may never be changed.
The flag's colours of white and red are said to stand for purity and the blood of Jesus Christ shed on the cross respectively.
The flag's ratio is 1:2.