"The Ubo are a Manobo sub-tribe who inhabit the more isolated mountains of Southwest Cotabato in the area known as Datal Tabayong, as well as, more ...
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southerly Davao del Sur. As of last count, they numbered close to 17,000 (OSCC, 1987); a follow up on their numbers in subsequent years has proved difficult." - http://www.ethnicgroupsphilippines.com/people/ethnic-groups-in-the-philippines/manobo-obo/, 22.12.2018