How Did the Nabataeans Get Water in Petra?

How did the Nabataeans get water in Petra, a city of tombs, temples and houses built in a dry, rocky valley in southern Jordan? The short answer is that they managed every drop. They piped water from springs through rock-cut channels and clay pipes, caught rare winter rain in hundreds of cisterns, built dams to slow and store run-off, and diverted dangerous flash floods away from the city's narrow entrance. That system let a trading people turn a desert stronghold into a capital.

The famous Treasury, carved into the rock at the end of the Siq, is the image most people know. But Petra's real achievement lies in the water engineering and the trade that paid for it. This article looks at both, and at the people who live around Petra today.

Who were the Nabataeans?

The Nabataeans were an Arab people who first appear clearly in written history in the late fourth century BCE. The Greek historian Diodorus of Sicily, drawing on an earlier eyewitness account, described them as desert people who kept their freedom by retreating into country where outsiders could not find water, and who stored rainwater in hidden underground cisterns lined with plaster. Knowledge of water was, from the very beginning, their power.

Over the following centuries they became wealthy middlemen on the caravan routes that carried frankincense, myrrh and spices from southern Arabia to the ports of the Mediterranean, as well as goods moving between Egypt, Syria and Mesopotamia. They protected the routes, supplied water and taxed the trade. By the first century BCE and the first century CE, under kings such as Aretas IV, Petra had grown into a monumental capital. Their inscriptions are in a form of Aramaic, and the Nabataean script is widely regarded as an ancestor of the Arabic script used today.

How did the Nabataeans get water in Petra?

Petra receives little rain, and most of it arrives in a few winter storms that can be violent. The Nabataean answer combined several techniques:

• Springs and channels. The main spring, Ain Musa (the Spring of Moses), rises in the modern town of Wadi Musa, just east of the site. Its water was carried several kilometres into the city. Along the walls of the Siq you can still see the rock-cut channel on one side and the remains of terracotta pipe on the other.
• Cisterns. Hundreds of cisterns, large and small, were cut into the rock or built across the site, collecting run-off from carefully shaped rock surfaces and gullies.
• Settling basins. Water often passed through small basins where silt could drop out before it reached storage or a fountain.
• Dams and terraces. Small dams in side valleys slowed floodwater, helped recharge the ground and stored water, while terraced fields on the surrounding slopes held soil and moisture for crops.

The engineers also understood pressure and gradient well enough to keep water flowing steadily through long pipelines. Excavations from the late 1990s identified a large garden and pool complex in the city centre, a striking statement in a desert: water was not just a necessity here but a display of wealth and control.

Taming the Siq: flash flood engineering

The Siq, the narrow gorge that forms the main entrance, is also a natural flood channel. To protect it, the Nabataeans built a dam at its mouth and cut a tunnel through the rock to send the floodwaters of Wadi Musa into a neighbouring valley instead.

The danger is not historical. In 1963 a flash flood in the Siq killed a group of visitors, and afterwards the ancient dam was rebuilt on its original line. Flood warnings still close parts of the site today. Anyone visiting Petra in the wetter months should take official warnings seriously, because the sky above the gorge can look harmless while rain falls miles away.

Romans, earthquakes and a long afterlife

In 106 CE the Roman emperor Trajan annexed the Nabataean kingdom, and it became part of the province of Arabia. Petra did not vanish overnight: it kept many of its buildings, gained Roman ones, and remained an important city, but trade routes gradually shifted. Earthquakes, especially a severe one in 363 CE, damaged buildings and water systems. In the Byzantine period Petra had churches and a bishop, and a cache of papyri found in one church shows a functioning community in the sixth century. Later its importance faded, though people never stopped living in and around it.

That is why the familiar story of Petra's "rediscovery" needs care. In 1812 the Swiss traveller Johann Ludwig Burckhardt reached Petra in disguise and became the first European known to describe it in modern times. It was a visit, not a discovery: local people had always known exactly where Petra was.

The Bdul and Petra today

Among the communities closest to the site are the Bdul (often written Bedul), a Bedouin people who for generations lived in Petra's caves and valleys, farming, herding and later working with visitors. Around the time Petra was inscribed as a UNESCO World Heritage Site in 1985, most Bdul families were moved to a purpose-built village at Umm Sayhoun, overlooking the site. Many now work in tourism as guides, traders and drivers. How residents feel about that relocation, about heritage rules and about the pressures and benefits of mass tourism varies from family to family, and it is a story best heard from them directly. You can read the official description of the site on the UNESCO World Heritage Centre website.

Why this matters on foot

Under the walk's current plan, Leon will cross Jordan from south to north, and Petra lies within that line rather than on a detour; you can follow the provisional line on the route page. He hopes to spend time at Petra with people who know it professionally and personally, looking past the Treasury to the channels, cisterns and trade routes that made it possible.

For a walker, water is the first question of every day in this landscape, so the Nabataean story will feel very practical. Like the Nabataeans, the walk depends on planning water between settlements; you can read how that shapes daily distances in how far can you walk in a day. Further south, Aksum is another trading power that grew rich between seas and deserts, explored in our piece on the Ark of the Covenant tradition at Aksum.

In every place he passes, an act of kindness is planned to be paid for and recorded on the kindness ledger. Read about Leon, follow the journal once he sets off, or support the walk.

Frequently asked questions

Where did Petra get its water from?

Mainly from springs such as Ain Musa, carried in channels and pipes, plus rainwater collected in hundreds of cisterns and stored behind small dams.

Why did the Nabataeans build a tunnel at the Siq?

To divert the floodwaters of Wadi Musa away from the Siq, the narrow entrance to the city, which would otherwise become a dangerous flood channel in heavy rain.

Who discovered Petra?

Nobody needed to: local people always knew it. Johann Ludwig Burckhardt, in 1812, was the first European known to describe it in modern times.

When did the Romans take over Petra?

In 106 CE, when Trajan annexed the Nabataean kingdom into the Roman province of Arabia.