Fu'an is 2.4 times larger than Tonga.
Area: 747 km2 World Factbook
Population: 106,440 (July 2014) World Factbook
Tonga, officially the Kingdom of Tonga, is a Polynesian sovereign state and archipelago comprising 176 islands with a surface area of about 750 square kilometres scattered over 700,000 square kilometres of the southern Pacific Ocean, of which 52 are inhabited by its 103,000 people. Wikipedia
Area: 1,821 km2 calculated
Fu'an is a county-level city of Ningde prefecture level city, in northeast Fujian province, PRC, some 150 kilometres away from the provincial capital Fuzhou. Wikipedia