Why Was Borobudur Buried Under Jungle and Ash for Centuries?

Borobudur, the world’s largest Buddhist temple, was abandoned sometime after the 10th century AD — likely due to a shift of political power away from Central Java and the gradual spread of Islam across the island — and lay buried under volcanic ash and jungle growth for nearly a thousand years before being rediscovered in 1814.

What Is Borobudur?

Built between approximately 780 and 840 AD by the Sailendra dynasty in Central Java, Indonesia, Borobudur is a monumental stone structure unlike almost anything else on Earth. The entire complex was assembled from around 72,000 cubic yards of volcanic andesite — and not a single drop of mortar was used. Instead, builders carved each block with interlocking knobs, dovetails, and tongue-and-groove joints. Gravity and the sheer mass of stone wrapped around a natural hill held every piece in place for over a millennium.

It was never a tomb. It had no interior worship hall. Borobudur was designed to be walked. Pilgrims climbed clockwise through nine terraces, moving from the earthly realm at the base toward enlightenment at the summit — a physical journey through Buddhist cosmology.

The Carvings and Statues

The walls of Borobudur carry 2,672 individual relief panels, roughly 1,400 of which depict narrative scenes from Buddhist scripture and the life of the Buddha. It represents one of the largest collections of Buddhist stone carving on the planet.

At the summit, 72 Buddha statues sit inside bell-shaped stone stupas with distinctive diamond-pattern lattice openings. Each statue is visible through the gaps — but unreachable. The uppermost tier represents the formless world, beyond desire and beyond grasping. The entire structure is a three-dimensional mandala: walk up it and you have traveled through the full arc of Buddhist cosmology in stone.

Why Did It Disappear?

No one knows with certainty why Borobudur was abandoned, and that ambiguity is part of what makes it so compelling. Two explanations are most widely accepted.

The first is political: in the 10th century, power in Java shifted eastward. New kingdoms rose in East Java, and Central Java’s cultural center faded. Borobudur, already a relic of a fading dynasty, may simply have been left behind.

The second explanation is religious: as Islam spread across the Indonesian archipelago during the 14th and 15th centuries, Java’s Hindu-Buddhist kingdoms declined. A monumental Buddhist pilgrimage site no longer had the community to sustain it.

What followed was geological. Volcanic ash from nearby Mount Merapi — one of the most active volcanoes in the world — gradually settled over the structure. Jungle moved in behind it. Within a few centuries, one of the greatest monuments ever built was hidden beneath vegetation and ash, known only in fragments of local legend.

How Was Borobudur Rediscovered?

In 1814, Thomas Stamford Raffles — then Lieutenant-Governor of Java under British administration — heard rumors of a great stone monument buried in the jungle near Magelang. He dispatched a 200-man team led by Dutch engineer H.C. Cornelius to investigate. They spent two months hacking through vegetation and removing debris, though several galleries remained too structurally unstable to fully excavate at the time. The complete monument was not fully uncovered until 1835.

What they found was still standing. Buried under centuries of ash and root systems, Borobudur had survived intact — a structure built without mortar, encoding an entire universe in volcanic stone, and waiting.