Ilocos Norte is located in the northern Philippines and its capital is Laoag City. At the province’s northern tip, the town of Pagudpud is known for its beaches, like Blue Lagoon, plus bell-shaped Timmangtang Rock and towering Kabigan Falls. The St. Augustine Church in Paoay, Ilocos Norte is one of UNESCOs World Heritage Sites in the Philippines.

Ilocos Sur is located in the Ilocos Region in Luzon and its capital is Vigan City which is located on the mouth of the Mestizo River. Vigan City was inscribed as UNESCO World Heritage City. Ilocos Sur is famous for old churches, ancestral houses, and cobblestone streets.

-https://www.discoverthephilippines.com/provinces-in-the-philippines/