The Banaue Rice Terraces, Ifugao Province, the greatest achievement of the Ifugao people. The oldest terraces are estimated to be at least 3000 years old.Philippines
The Igorot Society is the term for the collection of several ethnic groups in The Philippines that come from the Cordillera Administrative Region of Luzon. They inhabit the six provinces of Abra, Apayao, Benguet, Kalinga, Ifugao, and Mountain Province, as well as Baguio City. They are a pre-Hispanic highland society that has survived through Spanish colonization. This Prehispanic state is the oldest in the Philippines. This society predates the other prehispanic states in the Philippines (Sultanates of Sulu, Lanao & Maguindao; Rajahnates of Butuan & Cebu; Kingdoms of Maynila, Tondo & Maysapan; the State of Ma-i & the Confederation of Madyaas) which are maritime civilizations, in contrast to this society which is a mountainous high-land society. This society is composed of many tribes, mainly; the Bontoc, Ibaloi, Isnag (or Isneg/Apayao), Kalinga, and the Kankanaey
Carol R. Ember & Melvin Ember (2003). Encyclopedia of sex and gender: men and women in the world's cultures, Volume 1. Springer. p. 498. ISBN 978-0-306-47770-6.