BENEATH THE CANOPY AND CAVES Bulabog Putian National Park: Iloilo’s hidden forest treasure

ILOILO CITY — Beyond the sweeping sugarcane fields of central Iloilo lies an extraordinary natural sanctuary where ancient limestone caves, towering forest trees, diverse wildlife and the province’s revolutionary history converge.

Spanning 854.33 hectares across the municipalities of Dingle and San Enrique, Bulabog Putian National Park (BPNP) is one of Iloilo’s most important natural and historical treasures.

Its distinctive limestone formations, forest ecosystems and underground waterways provide vital habitats for wildlife while helping sustain the surrounding agricultural communities.

Established as a national park through Presidential Proclamation No. 760 on June 14, 1961, the protected landscape remains an important refuge for biodiversity in a province where much of the surrounding land has been converted to agricultural use.

A living sanctuary beneath the canopy

Walking along the park’s forest trails, visitors encounter a landscape alive with the calls of native birds and the rustling of long-tailed macaques among the trees.

Beneath the dense canopy, reptiles, including pit vipers and native lizards, inhabit the forest alongside endemic land snails and other wildlife.

Wild orchids, ferns and air plants cling to weathered limestone formations and tree trunks, contributing to the park’s rich vegetation.

Below ground, its network of limestone caves provides shelter for colonies of insect-eating and fruit-eating bats.

Insectivorous bats help regulate insect populations, providing natural pest control that can benefit neighboring agricultural areas.

Fruit bats, meanwhile, play an important ecological role as pollinators and seed dispersers, helping forests regenerate and maintain their biodiversity.

These functions make the park more than a refuge for wildlife, connecting its conservation value to the livelihoods of communities beyond its boundaries.

The Department of Environment and Natural Resources (DENR) describes Bulabog Putian as a second-growth molave and dipterocarp forest that supports native and endemic plant and animal species.

Its limestone landscape, shaped over millions of years by water and geological processes, contains caves, fissures and underground drainage systems characteristic of karst formations. 

Where nature preserves Iloilo’s revolutionary history

The park’s environmental significance is closely intertwined with its cultural and historical heritage.

During the late 19th century, its caves provided refuge to Filipino revolutionaries fighting Spanish colonial rule.

Among the most historically significant sites is Maestranza Cave, associated with the Cry of Lincud, which marked the beginning of the Philippine Revolution in Iloilo in 1898.

The cave served as a hideout for revolutionaries and later provided shelter during other periods of conflict.

Historic inscriptions left by freedom fighters remain visible on its walls, preserving messages of patriotism and resistance.

These markings offer a tangible connection to a time when the forest’s secluded terrain and limestone caverns provided protection for those fighting for freedom.

Today, the cave stands as both a historical landmark and a reminder that conserving Bulabog Putian also means safeguarding an important chapter of Iloilo’s past.

A natural defense against floods and drought

Above ground, the park’s forest canopy serves as a natural barrier against soil erosion and environmental degradation.

Native hardwood trees, including molave (Vitex parviflora), narra (Pterocarpus indicus) and century-old dao (Dracontomelon dao), form part of its diverse forest ecosystem.

Some mature trees reach heights of up to 40 meters, providing shade, wildlife habitats and protection for the forest floor.

Their extensive root systems help stabilize soil, while fallen leaves and other organic matter improve the ground’s capacity to absorb and retain moisture.

These natural processes can help reduce surface runoff and erosion during periods of intense monsoon rainfall.

The forest also contributes to local climate regulation by providing shade, moderating temperatures and helping maintain soil moisture.

But one of Bulabog Putian’s most important ecological functions lies beneath its limestone landscape.

Its karst terrain contains interconnected caves, underground streams and natural drainage channels that influence how water moves through the area.

According to DENR, the park’s underground river and creek systems contribute water to natural outlets, including Moroboro Spring, and drain toward the Jalaur and Ulian rivers.

These waterways form part of the broader landscape that supports agricultural production and water resources in Iloilo.

The surrounding environment also includes natural water features such as Lake Bito, highlighting the relationship between the area’s forests, limestone formations and freshwater ecosystems.

During periods of prolonged dry weather associated with El Niño, groundwater stored in limestone formations can help sustain springs and other natural water outlets.

The extent of this buffering effect depends on rainfall, groundwater storage and the condition of the surrounding watershed.

Maintaining healthy forest cover is therefore important not only for biodiversity but also for protecting the ecological processes that support local water resources. 

Protecting a fragile ecosystem

Despite its ecological and historical importance, Bulabog Putian faces conservation challenges that require sustained attention.

Human encroachment, the threat of illegal logging, improper waste disposal and disturbances to wildlife habitats can undermine the park’s natural functions.

Its subterranean ecosystems are particularly sensitive because excessive human activity can disturb bat colonies and damage delicate limestone formations.

Changes in vegetation cover and land use can also affect the movement of water through the park’s karst landscape.

Protecting these resources requires strict enforcement of national park regulations, responsible ecotourism and active participation from surrounding communities.

Community-led conservation efforts can help strengthen wildlife monitoring, forest restoration, environmental education and sustainable tourism.

Local guides also play an important role in helping visitors understand the park’s ecological and historical significance while encouraging responsible behavior.

As a protected landscape, Bulabog Putian demonstrates how biodiversity conservation can support both environmental protection and community livelihoods.

Preserving its forests, caves and water systems also means maintaining natural assets whose benefits extend well beyond the park’s boundaries.

A shared responsibility

Bulabog Putian National Park offers more than an escape into nature.

Its towering trees, hidden caves and underground waterways reveal how closely Iloilo’s natural environment is connected to its history, agriculture and communities.

For visitors, exploring this sanctuary comes with a responsibility to minimize their environmental impact.

That means staying on designated trails, avoiding disturbances to wildlife, properly disposing of waste and respecting restrictions intended to protect sensitive areas.

Supporting local guides and community-based conservation initiatives can also help ensure that tourism contributes to the park’s long-term preservation.

The forest that once sheltered revolutionaries now provides refuge for wildlife and helps sustain natural resources essential to nearby communities.

Its continued survival depends on whether present and future generations recognize the value of protecting both its ecological and historical heritage.

Bulabog Putian is more than a destination to admire.

It is a living reminder that safeguarding Iloilo’s natural treasures is an investment in the province’s environmental security, cultural identity and future. (DENR)