Ilocos Sur is a province of the Philippines located in the Ilocos Region in Luzon. Its capital is Vigan City and borders Ilocos Norte and Abra to the north, Mountain Province to the east, and La Union and Benguet to the south. To the west of Ilocos Sur is the South China Sea.

Geography
Ilocos Sur is subdivided into 32 municipalities and 2 cities.

Political

Vigan City
Candon City Cities

Alilem
Banayoyo
Bantay
Burgos
Cabugao
Caoayan
Cervantes
Galimuyod
Gregorio del Pilar (Concepcion)
Lidlidda
Magsingal
Nagbukel
Narvacan
Quirino (Angkaki)
Salcedo (Baugen)
San Emilio
San Esteban
San Ildefonso
San Juan (Lapog)
San Vicente
Santa
Santa Catalina
Santa Cruz
Santa Lucia
Santa Maria
Santiago
Santo Domingo
Sigay
Sinait
Sugpon
Suyo
Tagudin Municipalities
Ilocos Sur is located along the western coast of Northern Luzon. It is bounded by Ilocos Norte on the north, Abra on the northeast, Mountain Province on the east, Benguet on the southeast, La Union on the south, and the China Sea on the west. Its area of 2,579.58 square kilometers occupies about 20.11% of the total land area of Region 1.
The topography of Ilocos Sur is undulating to rolling with elevations ranging from 10 to 1,700 meters above sea level.