Nabataeans built hidden cisterns to bypass well taxes

The ancient frankincense and spice trade routes crossing the Arabian desert depended entirely on water, and for centuries the tribes controlling the desert's few known wells effectively taxed every caravan that had no choice but to stop there — control of water was control of the trade route itself, since no caravan could cross the desert without resupplying along the way. This gave well-controlling tribes durable leverage over anyone trying to move goods through the region.

The Nabataeans, based around Petra, depended on these same desert routes for the valuable frankincense and spice trade running from southern Arabia to Mediterranean markets, and had every reason to want to break the well-owners' toll leverage. Rather than fight for access to existing wells or attempt to seize them, the Nabataeans invested in building water infrastructure of their own that no rival could tax or withhold.

Built and hid 200+ private cisterns, so caravans crossed desert without rival wells, removing the chokepoint's leverage instead of negotiating within it.

Hidden cisterns meant no rival could tax or withhold water.

Caravans could use routes and timing competitors couldn't match.

Eliminating the chokepoint removed the toll-collectors' power.

The durable edge funded Petra's growth into a wealthy city.

When a gatekeeper controls a chokepoint resource, build your own independent supply—even at high upfront cost—to eliminate their leverage entirely.

This water independence let Nabataean caravans travel routes and timing no competitor relying on known wells could match, giving them a durable operational edge that translated directly into control of key segments of the Incense Route running from southern Arabia through Petra to Gaza — a dominance that helped fund Petra's growth into a major and famously wealthy desert city.