Ilocos Sur, formally the Province of Ilocos Sur, is a province in the Philippines. Ilocos Sur location is in the Ilocos Region of Luzon. Its capital Vigan City is located near the mouth of the Mestizo River. Ilocos Sur is bounded on the north by Ilocos Norte and Abra, on the east by Mountain Province, on the south by La Union and Benguet, and on the west by the South China Sea. Ilocos Sur: Past and...