Ilocos Sur
Overview
 
Ilocos Sur is a province
Provinces of the Philippines
The Provinces of the Philippines are the primary political and administrative divisions of the Philippines. There are 80 provinces at present, further subdivided into component cities and municipalities. The National Capital Region, as well as independent cities, are autonomous from any provincial...

 of the Philippines
Philippines
The Philippines , officially known as the Republic of the Philippines , is a country in Southeast Asia in the western Pacific Ocean. To its north across the Luzon Strait lies Taiwan. West across the South China Sea sits Vietnam...

 located in the Ilocos Region
Ilocos Region
The Ilocos region or Region I is a Region of the Philippines and is located in the northwest of Luzon. It borders to the east the regions of the Cordillera Administrative Region and Cagayan Valley and to the south the region of Central Luzon...

 in Luzon
Luzon
Luzon is the largest island in the Philippines. It is located in the northernmost region of the archipelago, and is also the name for one of the three primary island groups in the country centered on the Island of Luzon...

. Vigan City
Vigan City
The City of Vigan is a 5th class city in the province of Ilocos Sur, Philippines. It is the capital of the Province of Ilocos Sur...

, located on the mouth of the Mestizo River is the provincial capital. Ilocos Sur is bordered by Ilocos Norte
Ilocos Norte
Ilocos Norte is a province of the Philippines located in the Ilocos Region in Luzon. Its capital is Laoag City and is located at the northwest corner of Luzon Island, bordering Cagayan and Apayao to the east, and Abra and Ilocos Sur to the south...

 and Abra to the north, Mountain Province
Mountain Province
Mountain Province is a landlocked province of the Philippines in the Cordillera Administrative Region in Luzon. Its capital is Bontoc and borders, clockwise from the south, Ifugao, Benguet, Ilocos Sur, Abra, Kalinga, and Isabela.Mountain Province is sometimes incorrectly named Mountain in some...

 to the east, La Union
La Unión
La Union or La Unión may refer to:-Colombia:*La Unión, Antioquia*La Unión, Nariño*La Unión, Sucre*La Unión, Valle del Cauca-Peru:*La Unión Province, Peru...

 and Benguet
Benguet
Benguet is a landlocked province of the Philippines in the Cordillera Administrative Region in Luzon. Its capital is La Trinidad and borders, clockwise from the south, Pangasinan, La Union, Ilocos Sur, Mountain Province, Ifugao, and Nueva Vizcaya....

 to the south, and the South China Sea
South China Sea
The South China Sea is a marginal sea that is part of the Pacific Ocean, encompassing an area from the Singapore and Malacca Straits to the Strait of Taiwan of around...

 to the west.
The historic city of Vigan, which was inscribed in UNESCO
UNESCO
The United Nations Educational, Scientific and Cultural Organization is a specialized agency of the United Nations...

’s World Heritage List in November 1999, is found in this province.
 
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