Ilocos Sur (Ilokano: Abagatan nga Ilokos, Filipino:Timog Ilokos) is a province of the Philippines located in
the Ilocos Region inLuzon. Vigan City, located on the mouth of the Mestizo River is the provincial capital. Ilocos Sur is bordered
by Ilocos Norte andAbra to the north, Mountain Province to
the east, La Union and Benguet to the
south, and the South China Sea to the west.