Sumba, natively also spelt as Humba, Hubba, Suba, or Zuba is an Indonesian island located in the Eastern Indonesia and administratively part of the East Nusa Tenggara provincial territory. Sumba has a land area of 10,909.55 square kilometres, about the same size as Jamaica or the island of Hawaii. The population was 686,113 at the 2010 Census and 779,049 at the 2020 Census; the official estimate as of mid-2025 was 852,832. To the northwest of Sumba is Sumbawa, to the northeast, across the Sumba Strait, is Flores, to the east, across the Savu Sea, is Timor, and to the south, across part of the Indian Ocean, is Australia.