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The Lost World of Aquaterra

Dobson had read a book I’d written called The Fourth Part of the World, which tells the story of a small team of Renaissance cartographers who, in 1507, became some of the first to map the giant landmass that European sailors had begun to explore across the Atlantic.

✦ Extractive summary — built from the sources' own reporting•From 1 source•1 min read•Updated November 10, 2026, 12:00 PM UTC
Key points
  • If I wanted to learn more, he said, I should read “ Aquaterra Incognita,” a 2014 paper he’d published in the journal Geographical Review.
  • I first learned about Aquaterra more than a decade ago, when I received an email from the person who came up with the name—Jerome E.
  • To understand where—and what—Aquaterra is, Dobson writes, you have to think about how sea levels fall and rise during an ice age.

The result, as Dobson writes, is “a vast earth feature,” bounded by the highest and lowest sea levels of the glacial cycle, that “transforms back and forth among upland, wetland, and seafloor.” This Earth feature is what he calls Aquaterra.

Additional details
  • Aquaterra isn’t just the land now underwater; it’s the whole zone that the glacial cycles have alternately drowned and exposed.
  • For much of the most recent glacial cycle, Aquaterra was mainly terra, but today it’s mostly aqua.
  • Great rivers, fed by an abundance of lakes and smaller streams, cut their way through many of these lowlands, eventually opening out into marshes, lagoons, estuaries, and tidal flats as they approached the coast.
  • If you were able to speed up the glacial cycle and watch it from space, you’d observe the ebb and flow of a planetary tide—one that over the course of millennia alternately exposes and submerges immense expanses of land along the continental shelves.
  • As they dispersed, they developed technologies and vessels that allowed them to travel by sea; they devised hunting and fishing techniques that allowed them to accumulate surpluses of food and establish small permanent settlements; they buried their dead, built monumental structures, and organized themselves into social hierarchies.

How this summary was made: extractive summary — built from the sources' own reporting. It is drawn only from the reporting of the sources listed below — read the originals for full detail. How we summarize →

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The AtlanticNovember 10, 2026, 12:00 PM UTC →

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