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Uruk (modern Warka) lies in the alluvial lowlands of southern Iraq, about 300 kilometres southeast of Baghdad, in a region now largely desert but once threaded by the channels of the ancient Euphrates. The site covers approximately 550 hectares within its Late Uruk city walls — walls that may have been built by Gilgamesh himself, according to the epic — making it at its height (c. 3100–2900 BCE) by far the largest settlement on Earth.
German excavations at Warka, conducted by the Deutsche Orient-Gesellschaft from 1912 with interruptions through to the present day, have revealed a deep stratigraphic sequence spanning the Ubaid period (c. 5500 BCE) through the Parthian era (c. 200 CE). The critical period is the "Uruk period" (c. 4100–2900 BCE), when the city experienced explosive growth that archaeologists call the "Urban Revolution." The city was organized around two principal cult precincts: the Eanna, dedicated to Inanna (goddess of love and war, the city's patron deity), and the Anu Ziggurat, a monumental stepped platform topped by the White Temple dedicated to the sky god Anu.
The innovations associated with the Uruk period are among the most consequential in human history. Writing — specifically proto-cuneiform script, the earliest writing system — appeared here around 3200 BCE, initially as an administrative tool to track grain rations, cattle counts, and temple property. Cylinder seals (engraved stone cylinders rolled into clay to create unique impressions) were invented as a bureaucratic identity marker. Monumental public buildings with specialized functions (storage, administration, temple ritual) were constructed on a scale requiring centralized direction of labor. Long-distance trade networks linked Uruk to Anatolia, Iran, Egypt, and the Indus Valley.
Uruk's population during the Uruk period has been estimated at 40,000–80,000, with a surrounding territory of dependent villages. Its influence extended across a vast region: "Uruk colonies" — settlements with Uruk-style material culture — have been identified as far north as Arslantepe in Turkey and Habuba Kabira in Syria, suggesting a sphere of economic and cultural influence unprecedented in pre-history.
