Tonga, officially known as the Kingdom of Tonga, is a Polynesian island group country located in the southern Pacific Ocean in Oceania. It is surrounded by Fiji, Samoa and Vanuatu. Its official languages are Tongan and English and its capital and largest city is Nukuʻalofa.
The flag of Tonga was adopted in November 1875. The design consists of a red field with a white rectangle on the upper left canton featuring the red cross at its center.
| Capital City | Area (World Ranking) | 2022 Population (World Ranking) | Currency | Flag Ratio (Decimal) | Adopted |
| Nuku’alofa | 747 km² / 288 mi² (175th) | 99,328 (194th) | Tongan paʻanga (TOP) | 1:2 (0.5) | 1875 |