The Bicol Region, commonly shortened to Bicol and designated as Region V, is an administrative region of the Philippines. Also referred to as Bicolandia, it comprises six provinces, four on the Bicol Peninsula (the southeastern end of Luzon): Albay, Camarines Norte, Camarines Sur, and Sorsogon, and two off the shore: Catanduanes and Masbate. The regional center is Legazpi and has one independent component city, the pilgrim city of Naga. The region is bounded by Lamon Bay to the north, the Philippine Sea to the east, and the Sibuyan Sea and Ragay Gulf to the west. The northernmost provinces, Camarines Norte and Camarines Sur, are bordered to the west by the province of Quezon in the Calabarzon region. The Bicol Region comprises the southern part of Luzon, the largest island in the Philippine archipelago. The total land area is 5.9% of the total land area of the country. Around 69.3% of the total land area is alienable and disposable while the remaining 30.7% is public forest areas. The Bicol region was known as Ibalong, variously interpreted to derive from ibalio, "to bring to the other side"; ibalon, "people from the other side" or "people who are hospitable and give visitors gifts to bring home"; or as a corruption of Gibal-ong, a sitio of Magallanes, Sorsogon where the Spaniards first landed in 1567. The Bicol River was first mentioned in Spanish documents in 1572. The region was also called Los Camarines after the huts found by the Spaniards in Camalig, Albay. No prehistoric animal fossils have been discovered in Bicol and the peopling of the region remains obscure. The Aeta from Camarines Sur to Sorsogon strongly suggest that aborigines lived there long ago, but earliest evidence is of middle to late Neolithic life. A barangay (village) system was in existence by 1569. Records show no sign of Islamic rule nor any authority surpassing the datu (chieftain). Precolonial leadership was based on strength, courage, and intelligence. The native seemed apolitical. Thus, the datu's influence mattered most during crises like wars.