the main island of the Philippines

Luzon refers to the largest and most politically important island in the Philippines and to one of the three island groups in the country, with Visayas and Mindanao being the other two. Luzon as an island group includes the island of Luzon itself, plus the Batanes and Babuyan groups of islands to the north, and the main and outlying islands of Catanduanes, Marinduque, Masbate, Romblon, and Mindoro in the south. The island group of Palawan, which used to be a province belonging to an administrative region of Luzon has been transferred to Region VI in the Visayas in 2005.