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By Root 2049 0

in the invasion from Teotihuacan. The new rulers of Mutal had aggressively thrown their weight around and by Sky Witness’s time controlled as much as eight thousand square miles. (Mutal city itself had an estimated population of sixty thousand, plus many more in its hinterland.) Particularly important, the Teotihuacan-backed dynasty took over several outposts on the Usumacinta River system, Yucatán’s most important trade route. Shipments of luxury goods from faraway regions usually had to travel up or down the Usumacinta; Mutal’s ability to tax and supervise the trade must have been terribly vexing, even if it had little practical import. Sky Witness may have thought that Mutal was becoming a dangerous neighbor and decided to take preemptive action. Or he may have wanted to control the Usumacinta and its tributaries himself. A dynastic dispute may have been involved. Grube told me that he thought the kings of Kaan, never allied with Teotihuacan, may have wanted to stamp out pernicious foreign influences—xenophobia is a powerful motive in every culture. No matter what the motive, Sky Witness’s plan to dismantle Mutal was brilliant—in the short run, anyway. In the long run, it helped set in motion the Maya collapse.

Kaan and Mutal had a lot at stake. The Yucatán Peninsula is like a gigantic limestone wharf projecting into the Caribbean. Roughly speaking, the northwest-southeast line on which it joins the mainland runs through the middle of the Maya heartland. Despite receiving three to five feet of precipitation in an average year, this area is prone to drought. Almost all the rain falls during the May-to-December rainy season and rapidly sinks hundreds of feet into the porous limestone, from where it cannot easily be extracted. Little is available during the five hot, dry months between January and April. The region does have permanently water-filled swamps, sinkholes, and lakes, but often these are too salty to drink or use for irrigation. So toxic is the groundwater, a U.S.-Mexican research team remarked in 2002, that the Maya realm was “geochemically hostile” to urban colonization. Its occupation “more resembled settlement on the moon or Antarctica than most other terrestrial habitats.”

Most of the salt occurred in the sediments on the swamp bottoms. To make the water potable, the Maya laid a layer of crushed limestone atop the sediments, effectively paving over the salt. As the researchers noted, the work had to be done before the Maya could move in and set up their milpas and gardens. “Permanent, year-round populations could be established only in the presence of an anticipatory engineering of water supplies.” The Maya heartland, in other words, was a network of artificially habitable terrestrial islands.

As Maya numbers grew, so did the islands beneath them. North of Kaan, half a dozen small cities improved agricultural conditions by lifting up entire fields and carving out rain-retaining terraces on dry hillsides. Kaan itself dug out a series of reservoirs, established neighborhoods around each one, and linked the ensemble with roads and waterways. Central Mutal was ringed by a chain of seven reservoirs, with another central reservoir reserved for royalty. And so on.

Revamping the landscape both allowed Maya cities to expand and made them more vulnerable. Despite constant maintenance, erosion silted up reservoirs, hurricanes destroyed terraces, and weeds and sediment choked irrigation networks. Over time the Maya found themselves simultaneously maintaining existing systems and pushing out to cover past mistakes. If war damage made it impossible for a city’s inhabitants to keep up, they would be in trouble; island dwellers who wreck their homes have no place to move. One can speculate that the losers’ fear of having their backs to the wall generated the extraordinary tenacity of the Kaan-Mutal conflict.

Sky Witness’s strategy was to ring Mutal with a chain of client states and allies and then strangle it, boa constrictor–style. In this way Kaan would both acquire a dominant position in the Maya realm and destroy