Puerto Vallarta (pwārˈtō väyärˈtä) [key], city (1990 pop. 93,503), Jalisco state, W Mexico. Located on the expansive Bahía de Banderas [Bay of Flags], Puerto Vallarta has been used since the 16th cent. as a stopover point for ships making long sails along the western coast. Today it is one of Mexico's largest resort developments, known for its sports fishing and luxurious facilities.