The Bicol region was known as "Ibalong", variously interpreted to derive form "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.