Established in 1911 by the United States Coast and Geodetic Survey, this historic stone marker on Mount Mataas (Station Balanacan) serves as the primary geodetic reference datum (Origin Point 0) for all official maps, property surveys, and navigational charts across the Philippine archipelago. To reach the summit, visitors ascend a well-maintained 468-step concrete stairway enveloped by lush forest canopy. The viewing deck offers an unparalleled 360-degree panoramic vista overlooking the calm waters of Mompog Pass, Tayabas Bay, and the dramatic island coves of northern Marinduque. **Traveler Logistics:** Accessible via tricycle or chartered jeepney from Balanacan Port (approx 15 minutes) or Boac capital (35 minutes). Best visited during early morning or late afternoon for cool breezes and spectacular sunset photography.