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Mexico · North America
Lake Texcoco
What is Lake Texcoco, and where is it?
Lake Texcoco was a saline lake in the Valley of Mexico where the Mexica built Tenochtitlan, the Aztec capital, on an island in 1325. Located beneath present-day Mexico City, the lake was systematically drained after Spanish conquest, transforming the landscape and leaving only traces of the once-thriving water-based metropolis.
A Basin Lake in Mexico's Southern Highlands
Lake Texcoco occupied the southern half of the Valley of Mexico, a closed basin at 2,236 meters elevation in the country's central altiplano. The lake was the lowest point in a chain of five interconnected major lakes—Xaltocan, Zumpango, Chalco, and Xochimilco—that merged into one body during the rainy season from May to October. Groundwater aquifers fed much of the lake, with freshwater springs from Chalco and Xochimilco mixing with saline thermal springs. In winter months, the lakes separated into distinct bodies of water, a pattern managed by dikes and causeways built during the Late Postclassic period (1200–1521 CE).
The Valley of Mexico is an endorheic basin with no natural outflow, meaning water accumulated and evaporated rather than flowing away. Evapotranspiration accounts for 72–79 percent of precipitation in the region. Lake Texcoco occupied the minimum elevation in the valley, so water ultimately drained toward it. Today, the entire lake basin is almost completely occupied by Mexico City, with only a small area of salt marshes 4 kilometers east of the city marking the ancient lakebed.
From Pleistocene Depths to Aztec Settlement
Between the Pleistocene epoch and the last glacial period, Lake Texcoco reached its maximum extent 11,000 years ago, covering about 2,189 square miles and exceeding 500 feet in depth. The lake was fed by snowmelt from nearby mountain glaciers when the Valley of Mexico had a temperate climate. Between 11,000 and 6,000 years ago, the climate warmed and snowfall decreased, causing the water level to drop over millennia. Evidence suggests the lake may have disappeared and reformed at least 10 times in the last 30,000 years. Paleontological remains of seven Columbian mammoths dated between 10,220 and 12,615 years ago indicate human presence in the region.
Agriculture around the lake began approximately 7,000 years ago, with settlements following the lake's periodic inundations. Villages appeared on the northeast side between 1700 and 1250 BC. By 1250 BC, the Tlatilco culture emerged with more complex settlements and stratified social structures. Around 800 BC, Cuicuilco became the major power in the Valley of Mexico until the Xitle volcano destroyed it around AD 30. After Teotihuacan's fall around AD 600–800, several city-states coexisted around the lake in what Aztec chronicles described as a Golden Age, until the Tepanec from Azcapotzalco began dominating the area by 1300.
Tenochtitlan's Ingenious Water Engineering
The Mexica founded Tenochtitlan on an islet in the western part of Lake Texcoco in 1325. The city represented one of history's most remarkable examples of urban adaptation to a water-based environment. The Aztecs expanded the island using a system similar to chinampas, creating artificial land. To address the challenge of drinking water in a saline lake, they constructed dams to separate the salty lake water from freshwater runoff and rain. These dams also allowed the Aztecs to control the lake's water level. An inner system of channels within the city provided additional water management.
The Aztec ruler Ahuitzotl attempted to build an aqueduct bringing fresh water from the mainland to the lakes surrounding Tenochtitlan, but the aqueduct failed and the city suffered a major flood in 1502. During Hernán Cortés's siege in 1521, Spanish forces destroyed the dams, which were never rebuilt. This destruction left the new Mexico City built over Tenochtitlan vulnerable to flooding for centuries to come.
Centuries of Drainage and Ecological Collapse
After Spanish conquest, colonial authorities feared the lake's seasonal floods. Mexico City experienced severe inundations in 1604 and 1607, with an even more catastrophic flood in 1629 that kept most of the city underwater for five years. Under Enrico Martínez's direction, a drain was constructed to control water levels, but flooding persisted because much of the city lay below the water table. Channels and a tunnel to the Pánuco River eventually drained most of the lake, though complete flood control was not achieved until the twentieth century. In 1967, the Drenaje Profundo (Deep Drainage System) was completed—a network of several hundred kilometers of tunnels at depths between 30 and 250 meters, with a central tunnel 6.5 meters in diameter carrying rainwater out of the basin.
The ecological consequences of draining Lake Texcoco were severe and lasting. Parts of the valley became semi-arid, and Mexico City continues to suffer from water scarcity. Overdrafting of aquifers beneath the city has depleted groundwater reserves, causing Mexico City to sink an estimated 10 meters in the last century. The soft lake sediments underlying most of the city have made it vulnerable to soil liquefaction during earthquakes, as demonstrated catastrophically in the 1985 earthquake. Native species endemic to the lake region, including the axolotl, have become severely endangered or extinct due to ecosystem change.
Salt Marshes and Industrial Remnants
Today, Lake Texcoco exists only as a small area of salt marshes 4 kilometers east of Mexico City, covering part of the ancient lakebed. Small remnants of the other lakes—Xochimilco, Chalco, and Zumpango—also persist. The modern Texcoco Lake has a high concentration of salts, and its waters are evaporated for salt processing. A Mexican company, Sosa Texcoco S.A., operates an 800-hectare solar evaporator known as El Caracol on the lakebed.
The lake once hosted an endemic subspecies of Mexican garter snake, the critically endangered axolotl, and the now-extinct slender-billed grackle. Land reclamation of the lakebed was part of Mexico's twentieth-century development efforts, transforming the watery foundation of one of history's greatest cities into urban sprawl. Remnants of the ancient shoreline from the last glacial period remain visible on slopes of Mount Tlaloc and mountains west of Mexico City, serving as geological reminders of the lake's former scale.
Where is Lake Texcoco?
Lake Texcoco is in Mexico, North America, at 19.50°N, 98.99°W. The closest places in the Terravel atlas are Viñales Valley (1,621 km), Painted Desert (2,085 km) and Isabela Island (2,415 km).
Photos of Lake Texcoco
Photo: Cacum2 · CC BY-SA 4.0
Photo: Cacum2 · CC BY-SA 4.0
Photo: Cacum2 · CC BY-SA 4.0
Lake Texcoco at a glance
Questions about Lake Texcoco
How large was Lake Texcoco at its peak?
Lake Texcoco reached its maximum extent 11,000 years ago, covering approximately 2,189 square miles and exceeding 500 feet in depth. By the time of Tenochtitlan's founding in 1325, the lake had shrunk considerably from its Pleistocene dimensions due to climate warming and reduced snowfall.
Why did the Aztecs build Tenochtitlan on an island?
According to traditional stories, the Mexica wandered for 100 years before reaching the Valley of Mexico. They built on an island in Lake Texcoco in 1325, expanding it artificially using chinampa-like systems. The island location provided defensibility and access to water resources, though it required sophisticated engineering to manage freshwater supplies and flooding.
What caused Mexico City to sink?
Mexico City has sunk an estimated 10 meters in the last century due to overdrafting of aquifers beneath the city. Draining Lake Texcoco removed water that had supported the ground, and continued groundwater extraction depletes remaining reserves, causing subsidence in the soft lake sediments underlying the city.
What happened to the animals that lived in Lake Texcoco?
Native species endemic to the lake region have become severely endangered or extinct due to ecosystem change from drainage. The axolotl is critically endangered, and the slender-billed grackle is now extinct. The lake once hosted an endemic subspecies of Mexican garter snake.
Is there anything left of Lake Texcoco today?
A small area of salt marshes 4 kilometers east of Mexico City marks the ancient lakebed, with high salt concentrations used for commercial salt processing. Small remnants of the other lakes in the chain—Xochimilco, Chalco, and Zumpango—also persist. Geological features like ancient shorelines remain visible on nearby mountains.
Sources and further reading
This article was written from the reference material below, retrieved and reviewed for source alignment on September 13, 2026. Use official local sources for changing access or travel information.
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Test yourself
Which lake once held an island city with canals and temples, later drained to become a modern metropolis?
Lake Texcoco cradled the island of Tenochtitlan, the Aztec capital, which was systematically drained over centuries and is now buried beneath Mexico City.
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