The Kalanguya (also sometimes referred to as the Ikalahan) are an Austronesian ethnic group most closely associated with the Philippines' Cordillera Administrative Region, but whose core population can be found across an area which also includes the provinces of Nueva Vizcaya, Nueva Ecija, and Pangasinan. While this area spans Region I, the Cordillera Administrative Region, and Region II, it represents a largely geographically contiguous area. The Kalanguya are considered a subgroup of the Ifugao people. The term "Kallahan" is sometimes also used to refer to the Kalanguya people's native language. The Kalanguya population in Nueva Vizcaya has also been identified in anthropological literature as "Ikal-lahan". Those who reside in Tinoc and Buguias call themselves Kalangoya. Those who reside in Nueva Vizcaya and Quirino call themselves Ikalahans. In the past this ethnolinguistic group was known as Kalanggutan, Keley'I, Mandek'ey, Yatukka, or Kalangoya. Kalanguya language Kalanguya was once the most spoken language in most parts of today's Benguet, Nueva Vizcaya, Ifugao, Mountain Province, and some parts of Nueva Ecija. There are two classes of society, the rich (baknang or Kadangyan) and the poor (biteg or abiteng). Ikalahan practice swidden (“slash-and-burn”) farming (inum-an) of camote, and yam (gabi). Ikalahan houses, traditionally made for one nuclear family, have reeds (pal-ot) or cogon (gulon) for roofs, barks or slabs of trees for the walls, and palm strips (balagnot) for the floor. The houses are traditionally rectangular and raised from the ground 3–5 feet, with one main room for general activities and one window and door. There is usually a separate room (duwag) for visitors or single family members only, opposite the kitchen area. Two stone stoves are on a hearth, one cooks meals for the pigs in a copper cauldron (gambang), the other for the household. Shelves (pagyay) keep household utensils, including wooden bowls (duyo) and camote trays (ballikan or tallaka) made of rattan.