APARRI, a municipality (with administrative centre and 15 barrios or districts) of the province of Cagayan, Luzon, Philippine islands, situated on the Cagayan river near its mouth, about 55m. N. of the capital Tuguegarao, with which it has communication by small steamers. Population (1918) 20,603, of whom 10,489 were males; there were only five whites; literacy (based on ages from ten years up) 36.5%. The valley, with its short dry season, is one of the largest tobacco-producing regions in the Philippines. The municipality, which has a considerable coastwise trade, had in 1918 41 manufacturing establishments of all kinds, with capital of 146,800 pesos and a product valued at 265,300 pesos. It has a meteorological station, and in 1918 12 schools of all kinds. The inhabitants are mainly Ibanags and Ilocanos. Gov. Guido de Lavezares visited it in 1572 and Luis Gomez Dasmarinas somewhat later. In 1898 Filipino insurgents under Col. Daniel Tirona landed at the port. Civil government under the United States was established in 1901.