The iconic Biri rock formations in Northern Samar have officially been declared a National Geological Monument by the National Committee on Geological Sciences.
Located on Biri Island, this geological marvel features seven dramatic islets—Magasang, Magsapad, Macadlao, Puhunan, Bel‑at, Caranas, and Inanahawan—shaped by tectonic forces and ocean waves over 15 to 20 million years.
What makes Biri truly special is its mix of sedimentary rocks and rare volcanic components, such as phonolite and analcime clasts, which offer a window into the region’s ancient magmatic history.
The site’s rich scientific value lies in its potential as a “natural laboratory” for geologists and students studying stratigraphy, marine environments, and coastal landforms.
Officials also see the designation as a stepping stone for a larger goal: Northern Samar’s bid to become a UNESCO Global Geopark.
Governor Edwin Ongchuan praised the recognition, noting that it reflects Northern Samar’s deep heritage—not just in geology, but also in history, culture, and nature.