How water built the first cities

Every one of the first civilizations grew beside a river or a coast. Not one of them grew in a dry place away from water. The reason is a chain of four steps. Water gives a place a dependable food supply, because a river that floods at the same time each year gives a harvest at the same time each year. A dependable harvest produces more food than the farmers need. That extra food supports people who do not farm. Those people build the city. So cities formed where the water was, every time: on the Tigris and Euphrates, the Nile, the Indus, the Yellow River, the rivers on the coast of Peru, and the rivers on the Gulf coast of Mexico.

Water does one more thing. It transports goods. Moving cargo by boat costs far less than carrying it overland, so a river or a coast lets a city trade its extra food with cities far away. That turns many separate settlements into one connected network. This is why the first civilizations sit not only on water but on trade routes. A city with plenty of food but no route to anywhere stays small. A city with both grows, because it feeds itself and trades with everyone the water reaches. The map of the first cities is the map of where water and trade routes met.

Cradles of Civilization

Civilization appeared on Earth at least six separate times, in six separate places, and those six places had no contact with each other. Sumer, Egypt, the Indus Valley, China, Peru, and Mexico each built cities, large stone monuments, organised religion, and systems of record-keeping on their own. Two of the six were in the Americas, completely cut off from the other four. That separation is what proves the pattern. Wherever humans grew enough food to support people who did not farm, cities appeared, then rulers, then temples, then writing. Archaeologists call these six cases pristine civilizations, meaning they copied nothing. Every other civilization in history, including Greece, Rome, the Maya, and the Inca, descends from one of these six.

The two sections below run in date order. The first covers the settlements that came before civilization. The second covers the six independent starting points. The cultures that grew out of them are covered on a separate page.

Before civilization: the first settlements

These sites had permanent buildings and large populations. They had no cities, no government, and no writing. They show the stage between a village and a civilization.

Göbekli Tepe, Turkey, about 9500 to 8000 BCE. Hunter-gatherers built rings of large carved stones here before farming existed. That is why the site is famous. Researchers first described it as a religious site visited by travelling groups, with nobody living there. Later digging changed that view. It found houses, water tanks, channels for managing water, and ordinary household tools, so the site looks more like a settlement than a temple on its own. Some researchers argue that organised religion is what pushed humans into farming. That remains one theory, not a proven fact.
Jericho, Palestine, about 9000 BCE. This is the oldest walled settlement known on Earth, and people lived here from about 9000 BCE. The stone wall and the tower were built later, around 8000 BCE. Building them required a large group working together to a plan, 4,500 years before the first city.
Çatalhöyük, Turkey, about 7500 to 5600 BCE. A town of somewhere between 3,500 and 8,000 people, built with no streets. People walked across the rooftops and entered their houses through a hole in the ceiling. It was large and crowded, but it had no rulers and no public buildings, so it was not yet a civilization.

The six cradles: civilizations that started on their own

Each of these six developed with no example to copy. They are the confirmed cases of city life being invented from nothing.

Sumer, Iraq, about 3500 BCE. The first complete civilization. The Sumerians built the first real cities. The largest was Uruk, with more than 40,000 people. Then came Ur, with its great stepped temple, and Eridu, which the Sumerians themselves believed was the oldest city on Earth. They invented cuneiform writing, the wheel, and written law. Every later civilization in the Middle East built on what they started.
Egypt, about 3150 BCE. The Nile flooded at the same time every year, which made harvests dependable and paid for the first unified state to control a whole territory. One king ruled 1,000 km of river from the capital at Memphis, and later from Thebes. The pyramids of Giza are its largest monuments. Egypt held that unity, with some breaks, for 3,000 years.
Norte Chico, also called Caral, Peru, about 3500 to 1800 BCE. The oldest civilization in the Americas, and most textbooks leave it out. Its first city, Huaricanga, dates to around 3500 BCE. Large building projects are clear from 3100 BCE. Caral itself dates to around 2600 BCE, the same period as the Egyptian pyramids. Caral built large flat-topped mounds and round sunken squares. It did this without pottery, without writing, and archaeologists have found no evidence of war there.
Indus Valley, Pakistan and India, about 2600 BCE. The largest of the early civilizations by land area. Its cities Mohenjo-daro and Harappa had streets laid out in a grid, bricks made to one standard size, and water and drainage inside the houses. They contain no palaces and no royal tombs. Their writing has never been decoded.
China, Yellow River, about 1900 BCE. It starts at Erlitou, and it is confirmed under the Shang dynasty at their capital Anyang, where the oracle bones were found. Chinese civilization developed bronze casting and a writing system. That writing developed directly into the characters more than a billion people use today. China is the only one of the six whose culture continues without a break into the present.
Olmec, Mexico, about 1500 to 400 BCE. Every later civilization in Mexico and Central America descends from this one. The starting date is disputed, and it is often given as 1200 BCE, the point when San Lorenzo was at its largest. The Olmec centre was San Lorenzo first and La Venta later, and the giant carved stone heads stand at La Venta. The Olmec created the calendar, the religious ball game, and the tradition of building stone monuments. The Maya, the Zapotec, and the Aztec all took those from them.

The countries of the first civilizations

These are the countries where the six independent civilizations and the settlements before them were located. Each card below opens that country's page on this site.