Latest / Majapahit: The Empire That Once Ruled Indonesia — Fexingo History / Majapahit's Water Engineering: The Segaran and Trowulan's Canals
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- Lucas: So we've talked a lot about Trowulan — the capital, the temples, the palaces. But one thing I've only touched on in passing is how Majapahit actually kept that city running. And I mean literally running — with water. Luna: Water? Like aqueducts or something? Lucas: Exactly. Trowulan was built on a dry plain near the Brantas River, but it needed a massive, reliable water supply for its hundreds of thousands of residents, its rice fields, and its ritual baths. The solution was a sophisticated network of canals, reservoirs, and weirs that the Majapahit engineers designed and maintained for over two centuries. Lucas: The centerpiece of this system is the Segaran — a huge artificial lake, about 6.5 hectares in size, right in the heart of the capital. Archaeologists think it was built in the 14th century, during the reign of Hayam Wuruk. Luna: Wait — 6.5 hectares? That's like nine soccer fields. Lucas: Yeah, it's enormous. And the name 'Segaran' actually comes from the Javanese word for 'sea' — segara. So they literally called it a sea. It was a reservoir, but it also had symbolic meaning: in Hindu-Buddhist cosmology, water is associated with the cosmic ocean, the source of life and purification. Lucas: But the Segaran wasn't just a symbol. It was part of an integrated system. Canals brought water from the Brantas River, about five kilometers away, and distributed it through brick-lined channels to different parts of the city. Some of these channels were quite sophisticated — they had sluice gates to control flow and sediment traps to keep the water clean. Luna: How do we know all this? Is it in the Negarakertagama? Lucas: Partly. Mpu Prapanca mentions reservoirs and water management in passing, but the real evidence comes from archaeology. Excavations at Trowulan since the 1970s have uncovered dozens of canal segments, brick water tanks, and clay pipes. There's also a Chinese source — the Daoyi Zhilüe by Wang Dayuan, who visited Java around 1330, just before Hayam Wuruk's reign. He describes a city with 'many streams and canals' and 'abundant water'. Lucas: And then there's Candi Tikus — the 'Rat Temple' — which we've talked about before. That structure wasn't just a temple; it was a ritual bathing pool fed by a spring, with a miniature temple in the middle that represented Mount Meru. The water flowed in through a channel from the Segaran. Luna: So the water system had a spiritual purpose too. Lucas: Absolutely. In Hindu-Buddhist thought, water is a purifying element, and rulers were expected to provide for their people's material and spiritual needs. Building waterworks was both a practical necessity and a demonstration of royal piety. The king was seen as the source of prosperity, just like the monsoon rains. Lucas: The system wasn't just for drinking or bathing — it supported intensive wet-rice agriculture. Rice paddies around Trowulan were irrigated by canals that branched off from the main channels. That allowed multiple harvests per year, which in turn supported a large non-farming population of artisans, priests, and bureaucrats. Luna: So the whole empire rested on water management. Lucas: Pretty much. And it wasn't unique to Majapahit. Earlier Javanese kingdoms like Mataram had similar systems. But Majapahit scaled it up. The Brantas River was the key — it's one of Java's largest rivers, and the Majapahit engineers built weirs to divert water into canals. One of those weirs, at a place called Wringin Lawang, is still visible today. Lucas: Maintaining all this infrastructure required a centralized administration. There were officials specifically in charge of water management — the Negarakertagama mentions something called the 'dharmadhyaksa' in the context of water rights. And disputes over water were common, which is why the legal code, the Kutaramanawa, includes rules about irrigation. Luna: So when the empire declined, the water system probably fell apart too. Lucas: Exactly. After the Paregreg civil war in the early 15th century and the rise of Demak, Trowulan was gradually abandoned. The canals silted up, the Segaran was neglected, and eventually the whole system collapsed. By the time the Dutch arrived in the 17th century, the city was just ruins. But the water infrastructure left a lasting imprint — many of the modern canals in the region still follow the Majapahit routes. Luna: It's amazing that something so huge could just disappear. Lucas: It is. And it's a reminder that even the most advanced systems require constant maintenance. The Segaran itself was only rediscovered in the 1920s by Dutch archaeologists. Today it's a protected site, but it's mostly dry — you can see the brick lining and the old spillway. There are efforts to restore it, but it's tricky because the water table has changed. Lucas: One more thing that's fascinating: the Segaran was connected to a series of smaller reservoirs and ponds. Some of those ponds were used for fish farming — tilapia and carp. So the system wasn't just for irrigation and ritual; it was also a food source. That's the kind of integrated thinking that makes Majapahit's water engineering so impressive. Luna: Wait, they farmed fish in the capital? Lucas: Yeah. The Negarakertagama mentions fish ponds, and excavations have found fish bones and scales in the sediment. It was probably a way to supplement the protein supply for the urban population. So the water system served multiple purposes: drinking, bathing, irrigation, ritual, and aquaculture. Lucas: And all of this was managed without the kind of centralized, bureaucratic state you see in, say, China or Rome. Majapahit was more of a mandala — a network of semi-autonomous regions centered on the capital. But the water system tied it all together. The canals were like the veins of the empire, carrying lifeblood to every part of the city. Luna: I never thought of it that way. Makes you see Trowulan differently. Lucas: Yeah, me too. When you walk through the ruins today, it's easy to focus on the temples and the gateways. But underneath it all, there's this hidden network of brick and clay that made the whole thing possible. It's a testament to the ingenuity of the Majapahit engineers — and a reminder that civilization rests on infrastructure we often take for granted. Lucas: So next time you turn on a tap, think of the Segaran. Luna: I will. That's a good note to end on.