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 Luzon (; ) is the largest and most populous island in the Philippines. Located in the northern portion of the Philippines archipelago, it is the economic and political center of the nation, being home to the country's capital city, Manila, as ...

in the

Philippines The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...

. It has a total length of and a

drainage basin A drainage basin is an area of land where all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. A basin is separated from adjacent basins by a perimeter, t ...

of . It is notable because its main channel bisects the central townships of the municipalities of

Dingras Dingras, officially the Municipality of Dingras ( ilo, Ili ti Dingras; fil, Bayan ng Dingras), is a 2nd class municipality of the Philippines, municipality in the Philippine Province, province of Ilocos Norte, Philippines. According to the 2020 ce ...

and Sarrat, as well as that of the city of Laoag, which is the capital of Ilocos Norte. As a result, its waters have shaped the history and culture of these historic towns, and of the province of Ilocos Norte. It is the site of the Madongan Dam in Dingras, and is right beside

Laoag International Airport Laoag International Airport ( ilo, Sangalubongan a Pagpatayaban ti Laoag; fil, Paliparang Pandaigdig ng Laoag; ) is the main airport serving the general area of Laoag, the capital city of the province of Ilocos Norte in the Philippines. It is the ...

in Laoag.

References

Rivers of the Philippines {{Philippines-geo-stub