Petra

Placement requirements

• Must be built on: Desert, Floodplains

Unlock & cost

• Technology: Mathematics
• Production cost: 400

Wonders that compete for the same tiles

From the placement data: these wonders share a placement requirement with Petra. A city meant to hold both needs a separate qualifying tile for each.

• Etemenanki — both allowed on Floodplains
• Great Bath — both allowed on Floodplains
• Mont St. Michel — both allowed on Floodplains
• Pyramids — both allowed on Desert, Floodplains
• University of Sankore — both allowed on Desert

Is it worth building?

Desert tiles gain food, gold and production — the single biggest terrain transformation in the game. A desert city goes from struggling to top-tier overnight; with few desert tiles it does nothing.

Placement & timing tips

Count workable flat desert around the host city — a dozen tiles makes it game-changing. Mali and Nubia builds should plan a Petra city from settle one.

When to build it — and when not to

Build it when

Build when a city was settled for it on flat desert and can borrow the production to finish — stone chops, Magnus, purchased builders — because a half-committed Petra race ruins the whole city plan.

Skip it when

Skip when the desert is a thin fringe around decent land — those cities prosper without it. Feed the struggling desert town internal trade routes instead; they fix food and hammers immediately.

Which city should build it

Petra belongs in a satellite founded for it, almost never the capital, because a capital on flat desert grows too slowly for the opening. The ideal profile is a city center on a desert hill or river with flat desert and desert hills spilling across the second and third rings; floodplain tiles do not receive the bonus, so a floodplain-heavy river valley is a false positive. The wonder tile itself must be flat desert or a desert floodplain, and placing it beside a future Theater Square converts the site into culture as well. Pair the city with a Commercial Hub and Harbor if coastal, since the gold Petra adds makes every trade route from there heavier.

Winning the race

Contested moderately: desert-loving AI civs prioritise it, and any AI whose capital touches desert may pick it up by accident. Mathematics is a short detour from Currency, so the danger is not reaching the tech but building a Classical-cost wonder in a city that is by definition poor before the wonder exists. Corvée from State Workforce applies here, and desert cities usually have stone nearby to harvest; buy a builder with gold, chop everything harvestable into the wonder, and consider sending Magnus in for the chops. If the desert city has fewer than a handful of production and no chops within reach, the race is already lost on paper, whatever the AI is doing.

If you lose it: alternatives

Without Petra, the desert city needs a different reason to exist: a mountain-adjacent Holy Site or Campus, or a resource cluster worth improving. Feed it two domestic trade routes from the capital and it will at least reach a working size. Desert Folklore as a pantheon turns the same tiles into faith rather than food, which suits a religious plan better than a failed Petra anyway. The production earmarked for the wonder should become a Commercial Hub in the capital or a settler for better land. If the city truly has nothing, do not cling to it; a small trade-route town that never grows is a perfectly acceptable outcome.

Other wonders of the same era

• Apadana
• Colosseum
• Colossus
• Great Library
• Great Lighthouse
• Mausoleum at Halicarnassus
• Jebel Barkal
• Machu Picchu
• Mahabodhi Temple
• Statue of Zeus
• Terracotta Army

Related guides

• Wonder Priorities by Era: When to Contest, When to Let GoAn era-by-era framework for wonder decisions in Gathering Storm: which races are worth entering under each victory plan, how to read whether the AI will beat you, and what to build instead when you pass.Last reviewed: 2026-10-03
• Industrial Zones and Production Planning: Adjacency, Regional Reach, Power, and ChopsHow production actually gets made in Gathering Storm: what feeds Industrial Zone adjacency, how one Factory serves several cities, when power starts to matter, how to chop without wrecking appeal, and the sequencing mistakes that cost the most.Last reviewed: 2026-10-03
• Early District Planning: The First 100 TurnsHow to read city sites for future adjacency, decide between settling for yields now or reserving tile clusters, and know when a planned layout should be abandoned.Last reviewed: 2026-10-03