This dam solely irrigates the vast fields of the place including those of the nearby town of Libon and results in a good harvest.

A crier would shout nawaswas, giving the call to the people (in times of this kind of emergency) for immediate action in groups.

b) Early Spanish colonizers reaching this particular section of the Bicol Peninsula asked the name of the place from the about 600 natives living there, "Como se llama este sitio?"

From then on the early Spanish colonizers adopted in their official census the existence of "a rich fertile valley with verdant fields of grain" which is the little town of Oas in Bicol.

In 1605, Father Baltazar de los Reyes converted 12 leading natives of the area to Christianity in one day, forming the foundation of the community now known as Oas.

[5] Oas has been in the news several times in recent years due to the achievements of its outstanding citizens, notably chess prodigy Bince Rafael Operiano who topped the under-10 age category at the 6th Eastern Asia Youth Chess Championship in Bangkok in 2022,[7] and Miss Universe 2018 Catriona Gray whose maternal lineage has its roots in Oas.