Where can gravel be found in the Philippines?

Gravel can be found in various locations throughout the Philippines, particularly in riverbeds, coastal areas, and quarries. Major river systems, such as the Cagayan River and Agno River, often have abundant gravel deposits. Additionally, some provinces, like Rizal and Batangas, have active quarrying operations that extract gravel for construction purposes. The availability of gravel varies by region, depending on geological formations and environmental conditions.