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
Mount Aix Mount Aix Mount Aix is a mountain summit centrally located in the William O. Douglas Wilderness on land administered by the Wenatchee National Forest and is the highest point in that wilderness area. It is also 24 miles east-southeast of Mount Rainier in Yakima County of Washington state. Mount Aix is situated east of the crest of the Cascade Range, southeast of Bumping Lake, north of Bismarck Peak, and northwest of Rimrock Lake. Its nearest higher peak is Tieton Peak in the Goat Rocks Wilderness, to the south-southwest. Mount Aix is the highest peak in the entire region which is