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Ilocos Sur (Ilocano: Makin-abagatan nga Ilocos) is a province in the Philippines located in the Ilocos Region in Luzon. Its capital is the city of Vigan, located on the mouth of the Mestizo River. Ilocos Sur is bordered by Ilocos Norte and Abra to the north, Mountain Province to the east, La Union and Benguet to the south and the South China Sea to the west
