The Amburayan River is a river in the northwestern portion of island of Luzon in the Philippines. It originates from the Cordillera mountains and traverses the provinces of Benguet, La Union, and Ilocos Sur, with a total length of , emptying into the South China Sea. It is believed to be one of the longest rivers in northern Luzon. The river serves as the boundary between the provinces of Ilocos Sur and La Union.
The river's headwaters are a confluence of smaller creeks along the south of barangay Lubo, in Kibungan. Several other tributary creeks merge with the river as it flows along Atok and Kapangan. It then flows along the SugponâÂÂSan Gabriel boundary, the SugponâÂÂSantol boundary, the SugponâÂÂSudipen boundary, the SudipenâÂÂAlilem boundary, the SudipenâÂÂTagudin boundary, and finally at the TagudinâÂÂBangar boundary, where its river mouth is located.
This is listed from mouth to source.
In the Ilocano epic Biag ni Lam-ang, the hero Lam-ang came to bathe in the Amburayan as he was soaked in dirt and blood after a battle with headhunters. With the aid of young women from a neighboring village, he undertook the task of removing the contaminants, consisting of soil and blood, that had fouled the river's waters, resulting in the demise of aquatic life within its ecosystem.