Mount Data

Lore & Background

Mount Data has long attracted biologists. In 1895, Englishman John Whitehead collected mammals and birds there, later donated to the British Museum. Zoologist Oldfield Thomas identified many unknown species from that collection. Half a century later, Filipino biologist Dioscoro S. Rabor led an expedition that collected small mammals including Carpomys melanurus and Carpomys phaeurus. The mountain also yielded the bird Collocalia whiteheadi, known only from a specimen caught during Whitehead's expedition. Carpomys melanurus was first found on Mount Data in 1895.

Reader's Guide

Mount Data holds significance as a biodiversity hotspot and a historical site. Its slopes, covered with pine and mossy oak forests, host five major rivers and serve as a watershed for Mountain Province, Benguet, and Ifugao. The mountain's biological importance was documented by early collectors like John Whitehead and later by Dioscoro S. Rabor, revealing rare mammals and birds. Politically, Mount Data is the location of the 1986 Mount Data Peace Accord between the Philippine government and the Cordillera People's Liberation Army. The national park, established in 1936 and expanded in 1940, protects these ecological and historical resources. The mountain's legacy includes its role in scientific discovery and as a symbol of peace in the Cordillera region.

Did You Know?

• Mount Data was declared a national park in 1936 and expanded to 5,513 hectares in 1940.
• The mountain is the site of the 1986 Mount Data Peace Accord between the Philippine government and the Cordillera People's Liberation Army.
• Carpomys melanurus (greater dwarf cloud rat) was first found on Mount Data in 1895.
• The Agno River does not originate from Mount Data; its headwaters are in Mount Pulag.

Geography & National Park Designation

Rising to 2,310 metres (7,580 feet) in the rugged Cordillera Central range, Mount Data stands as one of the defining peaks in the northern reaches of Luzon Island, Philippines. Situated roughly 100 kilometres (62 miles) north of the highland city of Baguio, the mountain straddles the provincial boundary between Benguet and Mountain Province, with the Halsema Highway tracing a route along its vicinity. Its slopes are draped in dense pine forests and mossy oak woodlands, giving the peak a distinctly cool, cloud-tinged character. The mountain's ecological and scenic value earned it formal protection when it was declared a national park in 1936. Four years later, in 1940, the protected area was expanded to encompass 5,513 hectares (13,620 acres), a significant enlargement that secured a broader swath of the surrounding highland landscape under conservation management. This early designation placed Mount Data among the Philippines' oldest protected areas, reflecting a recognition—nearly a century ago—that its forests, waterways, and biodiversity warranted dedicated stewardship.

Hydrology & Watershed Function

Mount Data serves as a critical hydrological hub for much of northern Luzon. The national park is the source of five major rivers—the Chico, Ahin, Siffu, Abra, and Amburayan—each of which drains different portions of the mountain's watershed. In addition, the Agno River takes its origin on the mountain's slopes before flowing through the province of Benguet, making the peak a vital headwater for one of the region's most significant waterways. Beyond simply generating these rivers, the reserve functions as a broader watershed that supplies water to communities across Mountain Province, Benguet, and Ifugao. This means that the health of the pine and mossy oak forests covering the mountain's flanks is directly tied to the daily water needs of towns far from the summit. The 1940 expansion of the park to 5,513 hectares helped protect a larger catchment area, ensuring that the upstream forests and the filtration and storage they provide remained intact for the downstream populations that depend on them. In this way, Mount Data is not merely a scenic peak but a living water system sustaining an entire region.

Biological Diversity & Scientific Expeditions

Mount Data has long captivated biologists with its extraordinary biological diversity, and two landmark collecting expeditions shaped much of what the scientific world knows about its fauna. In 1895, the English naturalist John Whitehead assembled a vast collection of mammals and birds on the mountain. That mammal collection was subsequently donated to the British Museum, where the zoologist Oldfield Thomas examined it and concluded that many previously unknown species inhabited the area. Notably, the bird Collocalia whiteheadi—Whitehead's swiftlet—was known at the time only from a single specimen captured during Whitehead's expedition, underscoring how taxonomically rich the mountain's ecosystems were. Half a century later, the Filipino biologist Dioscoro S. Rabor led a major expedition that yielded a large collection of small mammals. Among the species documented were Carpomys melanurus, the short-footed Luzon tree rat, and Carpomys phaeurus, the white-bellied Luzon tree rat. The greater dwarf cloud rat, also identified as Carpomys melanurus, was first recorded on Mount Data in 1896, just one year after Whitehead's visit. Together, these expeditions established the mountain as a treasure trove of rare species, drawing sustained scientific attention for over a century.

Historical & Political Significance

Beyond its ecological and geographic importance, Mount Data carries a weighty place in the political history of the Cordillera region. In 1986, the mountain became the site of the Mount Data Peace Accord, a significant agreement negotiated between the government of the Philippines and the Cordillera People's Liberation Army. The choice of this location—high in the mountainous borderlands of Benguet and Mountain Province, along the Halsema Highway—carried symbolic resonance, placing the accord in the very heart of the Cordillera highlands where the parties' struggle was rooted. The accord represented a moment when the national government and the CPLA sat down to negotiate terms, using the mountain itself as a backdrop and a statement of shared territorial identity. For a peak already recognized since 1936 as a national park and valued for its watersheds, forests, and rare species, the 1986 event added a layer of human history to the natural legacy. Mount Data thus stands not only as a biological and hydrological treasure but also as a witness to the political aspirations of the Cordillera peoples, embedding its name in the broader narrative of Philippine peace.