The Amburayan River is a river in the northeastern 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 96 km, emptying into the South China Sea. It is believed to be one of the longest rivers in northern Luzon. It also offers a wide arra…The Amburayan River is a river in the northeastern 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 96 km, emptying into the South China Sea. It is believed to be one of the longest rivers in northern Luzon. It also offers a wide array of fun and excitement. The river serves as the boundary between the provinces of Ilocos Sur and La Union.