The canals of Xochimilco are the last living fragment of the lake system that defined the Valley of Mexico before the Spanish drained it to build their colonial capital. The chinampas — floating agricultural islands constructed by layering mud, vegetation, and anchored stakes — have been farmed continuously since the Aztec era, making this one of the oldest active agricultural sites in the Western Hemisphere. The trajineras (flat-bottomed, brightly painted boats) that navigate the canals carry tourists on weekends and agricultural workers on weekdays, and the contrast between the festive party-boat atmosphere and the quiet, productive chinampas is the tension that defines the place.
Vendor boats drift alongside selling elotes, quesadillas, pulque, flowers, and mariachi performances by the song. The flower market on dry land is one of the largest in the Americas. UNESCO World Heritage status protects the canal system but cannot fully protect the chinampas from the encroaching urban development that threatens the water table.
A weekday morning visit, when the canals are quiet and the agricultural function of the chinampas is visible, is a fundamentally different experience from the weekend carnival, and both are essential to understanding what Xochimilco is: a living pre-Hispanic landscape inside the twenty-first-century city.