Cordillera Central (Luzon) Sierra Madre Mountains, the longest mountain range in the country, through the Caraballo Mountains in Nueva Vizcaya province. During Spanish colonial period, the whole range was called "Nueva Provincia", (New Province). The Cordillera Central is the highest mountain range in the Philippines. It comprises about 1/6 of the whole Luzon island with a total area of . The highest mountain in the range, Mount Pulag, is also the highest mountain on Luzon Island at . It is officially the third highest mountain in the country after Mount Dulang-dulang and Mount Apo on Mindanao Island, the second largest island of the
Apo-eup Unified Silla in 757, when it made up two "myeon" in Gaeryeong-hyeon: Dong-myeon and Apo-myeon. This situation continued for more than a thousand years, until the massive reorganization of Korea's local governments in 1914, at which time the two "myeon" were united into the present-day entity of Apo-eup. Apo-eup was originally part of Gimcheon County; when the county was split into Gimcheon City and Geumneung County in 1949, it became part of Geumneung County. With the reunification of city and county in 1995, Apo-eup became part of Gimcheon once more. Apo-eup is located near the heart of the national transportation