Tongatapu 4
Located on the country's main island , Tongatapu , it encompasses part of Maʻufanga ( a district of the capital city , Nukuʻalofa ) , and the entirety of the villages of Houmakelikao , ʻAnana , ʻUmisi , Fangaloto , Popua , Patangata , Nukunukumotu , Tukutonga , and Pangaimotu . 
<triplet> Tongatapu <subj> Nukuʻalofa <obj> capital