The Padsan River, also known as the Laoag River and the Sarrat River, is the largest river in Ilocos Norte on the island of Luzon in the Philippines. It has a total length of 73.1 kilometres (45.4 mi) and a drainage basin of 1,320 km2 (510 sq mi). It is notable because its main channel bisects[1] the central townships of the municipalities of Dingras[2] and Sarrat,[3] as well as that of the city of Laoag, which is the capital of Ilocos Norte.[4]
As a result, its waters have shaped the history and culture of these historic towns, and of the province of Ilocos Norte.[5] It is the site of the Madongan Dam[6] in Dingras, and is right beside Laoag International Airport in Laoag.[7]
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