The Engineering Marvels of the Ancient Terraces of Besao

The Engineering Marvels of the Ancient Terraces of Besao

A Story Written in Stone and Soil

Stand at the edge of Besao on an early morning, when the mist still clings to the mountains like a blessing, and you will see them. Terraces cascading down the steep slopes like giant steps leading to the sky, their stone walls dark with age and moisture, their surfaces reflecting whatever light manages to pierce the cloud cover. These are not merely agricultural fields. They are monuments to human ingenuity, testaments to the stubbornness of our ancestors who looked at impossible mountains and said, "Here, we will grow rice."

If you are from Besao, you already know this landscape intimately. You have walked these narrow terrace walls as casually as others walk sidewalks, balancing bags of fertilizer or bundles of seedlings with the easy confidence that comes from a lifetime of practice. You have helped repair stone walls after landslides, your hands muddy as you fit rock to rock the way your grandfather taught you, the way his grandfather taught him. But do you know the full story of what you are maintaining? Do you understand the engineering genius embedded in every carefully placed stone?

This is your story, told through the language of terraces.

The Engineering That Built a Civilization

The rice terraces of the Cordillera climb up to 300 meters up steep slopes, supported by walls of earth and stone that can reach heights of 15 meters. Think about that for a moment. Fifteen meters. That is as tall as a five-story building, built without concrete, without steel reinforcement, without modern engineering calculations. Just stone, mud, and an understanding of physics that came from observation, experimentation, and countless generations of accumulated knowledge.

The Kankanaey people of Besao, like their Ifugao neighbors to the east, did not stumble into terrace building by accident. The sustainable irrigation systems demonstrate a deep understanding of engineering principles in managing water resources for rice cultivation. Our ancestors were scientists who could not read or write but who understood hydraulics, soil mechanics, and structural stability in ways that would impress modern engineers.

Consider the construction process. Farmers build stone walls during the dry season, as walls constructed during the rainy season collapse easily because the soil is loose. This was not superstition but practical engineering knowledge. They understood that construction materials behave differently depending on moisture content, that timing matters as much as technique.

Preferred stones have different shapes with regular size, and except for the two foundation stones, random bonding is employed in stone walling. Each stone was carefully selected and positioned. Angular and irregularly shaped stones allow for more contacts between elements and ensure greater stability under conditions of weathering, seepage, and ground movement due to earthquakes. Our ancestors, living in a land where the earth regularly shakes, built walls that could flex and settle without collapsing completely, an engineering principle that modern seismic design only rediscovered in recent decades.

The walls were not built all at once. As fill is sluiced in and leveled behind the gradually rising masonry, each stone is carefully laid in its best tilted position. They used a technique called hydraulicking or "bulubul," where water pressure moved soil and stones from higher elevations to fill behind the growing walls. This was not just efficient; it was brilliant. The finest particles in the sluiced material bonded the stones together better than any mortar, creating walls that have stood for generations.

Water, The Liquid Thread That Binds

But stone walls alone do not make rice terraces. Water is the essential element, and managing water in these steep mountains required engineering as sophisticated as the walls themselves.

Water from springs, creeks, and rivers are diverted and dammed in an impounding area before distribution to different rice fields by means of artificial irrigation channels and water conveyor troughs. Walk through any barangay in Besao and you will see these channels, some carved into rock faces, others constructed from wood or bamboo, all carefully maintained because everyone understands that broken irrigation means failed crops.

The channels are not random. There are three general principles being observed by farmers in water management: heavy flow of water must be diverted from the terraces, entry of water to the pond fields must be gradual, and inundation must be maintained at all times. Too much water, too quickly, and terraces collapse. Too little water, and rice dies. The system had to be calibrated perfectly, and it was.

A grouping of adjacent fields forms a himpuntona'an, a traditional agricultural district that includes a ritual plot that is the first to be planted and harvested, and several such districts share a single water catchment area and cooperate in regulating irrigation and land use. This was not just engineering; it was social engineering. The terraces required cooperation. Water rights had to be negotiated. Maintenance had to be coordinated. The physical structure of the terraces shaped the social structure of the community.

This is why the dap-ay, the traditional council of elders, was so important in Besao. Members of the dap-ay are expected to equally share the expenses and labor requirements of activities like repairing irrigation ditches and paddy field walls or maintaining trails. The terraces could not exist without community cooperation, and community cooperation was formalized through institutions like the dap-ay that made decisions binding on everyone.

The Agricultural Cycle (Engineering Meets Ritual) 

The construction of terraces in Besao followed the rhythm of the agricultural calendar. In Bagnen, Bauko, Mountain Province, the phases of agricultural cycle are the sama or sowing of seeds starting in August, toned or transplanting in December, kames or weeding and putting up a scarecrow starting February, lugam or cleaning of the stone wall starting in April, and latab or harvesting starting in June.

Notice that wall cleaning and repair comes in April, during the dry season before the heavy monsoon rains. This was not coincidence. The Ifugao approaches terrace building with respect to the agricultural cycle, planning land use, irrigation and drainage channeling, and work phasing from July to October bearing in mind to finish construction in time for the planting season in November to early December. Engineering decisions were integrated into the cultural calendar, marked by rituals that reminded everyone when specific tasks needed to be done.

The begnas ceremonies, the thanksgiving rituals for rice, were not just religious observances. They were also practical mechanisms for coordinating community labor, for reminding everyone of their obligations to maintain the system that sustained everyone. When the mumbaki performed rituals before planting or at harvest, they were not just appeasing spirits; they were marking the phases of a complex agricultural and engineering cycle that required precise timing to succeed.

The Challenges Our Ancestors Faced

Do not romanticize the past. Building and maintaining these terraces was brutally hard work. The construction of the terraces was accomplished by hand, with farmers using simple tools such as hoes, spades, and baskets, involving cutting into hillsides and building walls with stones, mud, and clay.

Imagine carrying river stones up steep mountainsides, one basket at a time. Imagine shaping earth with wooden tools, day after day, year after year. Mud and hard, round stones are brought up the slopes from the river below to reinforce the terrace walls. The nearest river might be hundreds of meters below, down slopes so steep that one misstep could be fatal. Yet this was done repeatedly, by people who had no choice but to make the impossible possible.

Landslides were constant threats. Heavy rains could wash away weeks or months of work in minutes. Earthquakes could crack walls that had stood for generations. Droughts could dry the carefully engineered irrigation systems. Our ancestors faced all these challenges without modern weather forecasting, without emergency relief systems, without the safety nets we take for granted today.

They persevered not because they were superhuman but because they had no alternative. The lowlands were occupied by other peoples. The mountains offered security but demanded adaptation. So they adapted, and the terraces are the physical embodiment of that adaptation.

The Living Cultural Landscape

What makes Besao's terraces particularly significant is that they remain, in many places, living cultural landscapes. These are not archaeological ruins or museum pieces. They are working agricultural systems, still producing rice using techniques refined over centuries.

For 2,000 years, the high rice fields have followed the contours of the mountains, fruit of knowledge handed down from one generation to the next, and the expression of sacred traditions and a delicate social balance. When you plant rice in your family's terraces in Besao, you are participating in an unbroken tradition that stretches back into the mists of prehistory, connecting you to countless ancestors who performed the same actions in the same places.

The terraces are recognized alongside others in the Cordillera for their exceptional value. The terraces illustrate a persistence of cultural traditions and remarkable continuity and endurance, since archaeological evidence reveals that this technique has been in use in the region for 2000 years virtually unchanged. While the famous Ifugao terraces at Banaue and Batad receive more tourist attention and UNESCO recognition, the terraces of Besao, including those at Bucas and other barangays, represent the same engineering genius and cultural significance.

Reaching a higher altitude and being built on steeper slopes than many other terraces, the complex of stone or mud walls and the careful carving of natural contours of hills and mountains to make terraced pond fields, coupled with the development of intricate irrigation systems harvesting water from the forests of the mountain tops, reflect a mastery of engineering that is appreciated to the present (UNESCO) .

The Crisis We Face Now

But we must be honest about the present situation. The terraces of Besao, like those throughout the Cordillera, face an existential crisis that may prove more dangerous than any landslide or drought our ancestors faced.

Due to poverty, many farmers are shifting to vegetable production which promises more income in a short time compared to rice, which takes six months to grow and offers less market value, but this shift demands the use of chemical fertilizers and pesticides which could damage the fertility and ecology of the rice terraces. The economic calculation is stark: rice farming in terraces is labor-intensive and provides limited financial return. Vegetables, coffee, or off-farm employment offer better income with less physical labor.

Young people are leaving. By 2001, around 30 percent of the rice terraces lay abandoned as many Ifugao began migrating to urban areas in search of other work. While this statistic refers to Ifugao, the same trend affects Besao. How many families in your barangay still actively farm all their ancestral terraces? How many terraces are slowly being reclaimed by vegetation as no one remains with the time or inclination to maintain them?

The decline of cooperative farming tradition has led to rising labor costs, which farmers can hardly afford, and the repair of the terraces requires funding which farmers do not have. The old system of communal labor, where neighbors helped each other without payment, has largely broken down. Now labor must be paid, often in cash, which rice farming cannot generate in sufficient amounts.

When terraces are abandoned, the engineering begins to fail. Once dry, the soil becomes like clay and it cracks easily, so when water is poured into a paddy that has dried up, it often collapses, taking with it the stone wall that borders the paddy. Each collapsed wall represents not just lost agricultural land but the erosion of centuries of accumulated knowledge and labor.

What We Must Remember

If you are reading this in Besao, look around you. Those terraces you see every day, that you perhaps take for granted as just part of the landscape, represent one of humanity's great engineering achievements. They are proof that sophisticated technology does not require written blueprints or advanced mathematics, that sustainability is not a modern invention but an ancient practice, that human beings can transform harsh environments into productive landscapes through cooperation, ingenuity, and persistence.

The stone walls of Besao's terraces are monuments as significant as any cathedral or palace, except they were built not to glorify rulers or gods but to feed families and communities. They represent thousands of years of cumulative innovation, with each generation adding refinements and improvements to techniques passed down from their ancestors.

When you help repair a terrace wall, you are not just maintaining agricultural infrastructure. You are preserving engineering knowledge that took millennia to develop. When you participate in the agricultural rituals, you are keeping alive the social practices that made the engineering possible. When you teach your children about terrace farming, you are passing on a legacy that connects you to the very beginnings of Kankanaey civilization in these mountains.

The rice terraces are a memorial to the history and labor of more than a thousand generations of small-scale farmers who, working together as a community, have created a landscape based on a delicate and sustainable use of natural resources. You are part of that thousand generations. The choices you make about whether to maintain your family's terraces, whether to pass on the knowledge to your children, whether to participate in the communal labor that terrace farming requires—these choices will determine whether the terraces of Besao survive another generation or slowly crumble into history.

The ancient engineers of Besao, who first carved these mountains into productive farmland, faced challenges as great as those we face today. They had fewer tools, less knowledge, harder conditions. Yet they succeeded in creating systems that sustained communities for countless generations.

We, their descendants, inherit not just their terraces but their resilience, their creativity, their refusal to accept that mountains are unfit for human habitation. The terraces of Besao are not just engineering marvels of the past. They are living challenges to the present, asking us whether we have the wisdom to preserve what our ancestors built, whether we can find ways to make these ancient systems viable in the modern world, whether we value our heritage enough to do the hard work of maintaining it.

That is the true engineering marvel of Besao's terraces: not just that they were built, but that they endure, waiting to see if we prove worthy of the inheritance.

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Author's Note: This article draws on general research about Cordillera rice terraces, as specific detailed documentation about Besao's terraces remains limited in published sources. The engineering principles described apply broadly to Kankanaey terrace systems throughout Mountain Province, including those in Besao. If you have stories, photographs, or detailed knowledge about Besao's specific terraces, particularly at Bucas and other barangays, please share them with local cultural heritage workers so this knowledge can be properly documented and preserved for future generations.