Tongatapu 2
Located on the country's main island , Tongatapu , it encompasses part of Kolofoʻou ( a district of the capital city , Nukuʻalofa ) , and the villages of Fanga-ʻo-Pilolevu , Mailetaha , Haveluloto , Tofoa , and Koloua . 
<triplet> Tongatapu <subj> Nukuʻalofa <obj> capital