Apayao is a landlocked province of the Philippines located in the Cordillera Administrative Region in Luzon. Its capital town is Kabugao.

The province borders Cagayan to the north and east, Abra and Ilocos Norte to the west, and Kalinga to the south. Prior to 1995, Kalinga and Apayao comprised a single province named Kalinga-Apayao, which was partitioned to better meet the needs of individual ethnic groups.

With a population of 119,184 (as of 2015 census) covering an area of 4,413.35 square kilometres (1704 sq. mi), Apayao is the least densely-populated province in the Philippines.

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