It occupies 62% (nearly two-thirds) of the entire island, being much less densely populated than the western third.

[1] The East Sumba Regency is composed of twenty-two districts (kecamatan), whose areas (in km2) and populations at the 2010 Census[2] and 2020 Census[3] are listed below, together with the official estimates as at mid 2023.

[1] The table also includes the locations of the district headquarters, the number of administrative villages in each district (totaling 140 rural desa and 16 urban kelurahan), and its postal code.

(f) comprises 4 kelurahan (Hambala, Kamalaputi, Kambajawa and Matawai) and 3 desa (Lukukamaru, Mbatakapidu and Pambotandjara).

(g) comprises 7 kelurahan (Kambaniru, Lai Mbonga, Lambanapu, Malumbi, Mau Hau, Prailiu and Wangga) plus the desa of Kiritana.