What is known and what is theory
Percy Fawcett was a real British explorer who disappeared in the Brazilian interior in 1925. The “Lost City of Z” was his own private theory that a large, old, stone-built settlement lay hidden in the forest of Mato Grosso. No such stone city has ever been found, and Z remains unproven. What has been found, much later and in the same broad region, is a network of earthwork settlements built by Indigenous peoples. Those sites are real and important, but they differ from what Fawcett imagined, and they do not prove that he was right about Z.
Percy Fawcett
Fawcett was born in 1867 and trained as a military surveyor. He worked for the Royal Geographical Society, and in the early twentieth century he took part in boundary surveys in South America, especially along the borders of Bolivia. These journeys through remote forest made his name as a determined and unusually durable explorer. He also came to hold views that many contemporaries found eccentric, including an interest in spiritual and occult ideas, and he was convinced that South America hid the remains of a sophisticated ancient civilisation.
His theory drew on several sources. One was an old Portuguese manuscript in Rio de Janeiro, usually called Manuscript 512, which described a party of explorers in the eighteenth century who reported finding ruins deep in the interior. Fawcett took it seriously, though historians have questioned how reliable it is. He also collected stories from local people and earlier travellers. He eventually gave the imagined city the label Z, partly to keep its supposed location secret.
The 1925 expedition
In 1925 Fawcett set out into the upper Xingu region with his son Jack and Jack’s friend Raleigh Rimell. They travelled from the town of Cuiaba and into land about which outsiders then knew very little. The last messages that reached the outside world came from late May 1925, when Fawcett wrote that they were heading further in. After that, nothing certain was ever heard of the three men.
Their disappearance caused a long-running public sensation. Newspapers speculated, and a number of search parties went into the forest in the years that followed. One of the best known was led by the explorer George Dyott in 1928. The searchers found hints and rumours, but no clear answer. Some stories said the men had been killed by an Indigenous group, others that they had died of disease or hunger or had simply been lost, and a few suggested that Fawcett had chosen to stay. None of these ideas has been settled by solid evidence.
In the early 1950s bones were handed over after being said to be Fawcett’s, but later examination did not confirm that they were his. Over the decades, many further claims have been made, and it is safest to say that the fate of the party is still not known for certain.
Why Z has not been confirmed
Fawcett’s picture of Z was shaped by ideas current in his day, which often assumed that complex societies could not have arisen in tropical forest without outside influence. That assumption has since been questioned, and modern scholars are generally cautious about the older view. The problem with Z is different, however: Fawcett never published evidence of the city itself. He had no photograph, excavated plan or artefact to show. All that survives is his reasoning, his notes, and the writings later edited by his family, including the book Exploration Fawcett, published in 1953 from his papers.
Because the idea of Z cannot be tested against anything he found, it is best described as a hypothesis or a hunch, not a discovery. This is true even though the broader region turned out to contain real archaeology.
What archaeologists found in the Xingu
From the 1990s, researchers working with the Kuikuro people and other communities of the Upper Xingu, a group often associated with the archaeologist Michael Heckenberger, documented a pattern of large settlements. They described circular and rectangular plazas, defensive ditches, raised roads and bridges across wetlands, along with signs of organised planning. Radiocarbon dating suggests that many of these places were occupied in roughly the period between about 1200 and 1600 CE, before and into the early colonial period, though scholars continue to refine the dates.
These were not cities of stone. Like the Cahokia mounds in North America, they were earthen constructions, but here built of earth and timber, with wide communal spaces, and they lay within a landscape managed through farming, fishing and forest gardening. Researchers have debated how large their populations were and how best to describe them, and “garden city” and similar labels are interpretive, not settled. Some estimates are cautious and suggest settlements of at most a few thousand people; others are higher.
Later aerial and LiDAR survey in the Amazon has revealed many more earthworks, including geometric ditched enclosures in other areas of the basin. Combined with field excavation, these results have changed how archaeologists think about the pre-contact Amazon. The forest was not empty wilderness. It held varied societies that shaped their environment over centuries, and their descendants, including the Kuikuro, still live in the Upper Xingu today.
Does this vindicate Fawcett?
Only in a limited sense. The finds show that Fawcett was right to suspect that the Amazon concealed more human history than European scholars then admitted. They do not show that he located a lost stone city, and the Xingu settlements were not hidden from the people living around them, since their descendants have long known the land. Equating them with Z risks overlooking what they actually are: the achievements of particular Indigenous communities, studied in their own right.
The idea of jungle-swallowed cities makes a good story, but the comparison with other forest ruins is instructive. The Tikal rainforest ruins in Guatemala were known to local people long before outside scholars mapped them, and the same is true across the Americas. A “lost” city is often one that outsiders had not yet recorded, not one that nobody knew, and that is a useful way to read the story of Z.