The Rice Terraces of the Philippine Cordilleras were inscribed on the UNESCO World Heritage List in 1995, the first-ever property to be included in the cultural landscape category of the World Heritage List. This inscription has five sites: the Batad Rice Terraces, Bangaan Rice Terraces (both in Banaue), Mayoyao Rice Terraces (in Mayoyao), Hungduan Rice Terraces (in Hungduan) and Nagacadan Rice Terraces (in Kiangan), all in the Ifugao Province, the Philippines. The majority of the Rice Terraces were constructed in a short time span after the Spanish arrival to the Philippines. the Ifugao Rice Terraces reach a higher altitude and were built on steeper slopes than many other terraces. The Ifugao complex of stone or mud walls and the careful carving of the natural contours of hills and mountains to make terraced pond fields, coupled with the development of intricate irrigation systems, harvesting water from the forests of the mountain tops, and an elaborate farming system.