From WikiPilipinas: The Hip 'n Free Philippine Encyclopedia
The Manguangan makes up the indigenous people living in the Cordillera Sugut mountains in Mindanao. Estimated to reach 3,488 in numbers in 1987,they are scattered up to the great lakes of Buayan or Maguindanao and in the territory between what is occupied by the Manobo and the Mandaya in Davao and South Cotabato. Due to this close geographic proximity with the two tribes, they usually are thought members of those although the Jesuits and others take them as a distinct ethnic group.
- "Manguangan" http://www.ncip.gov.ph/resources/ethno_detail.php?ethnoid=69(July 16, 2007)