Tokū is an uninhabited, volcanic island in Tonga. It is located in the very north of Vavaʻu group in the north of the country. It is about 1,000 metres (3,300 feet) long and up to 700 metres (2,300 feet) wide, yielding an area of 0.4 square kilometres (0.2 square miles). It is up to 8 metres (26 feet) above sea level near its east coast.
The closest island is Fonualei 19.7 km to the northwest.