Datum Madison refers to the city of Madison, Wisconsin on Datum Earth.

The Long Earth

In 2030, Humanity First detonated a nuke, destroying the city.[1]

The Long War

In 2040, after the Madison bombing, nobody was allowed to stay too long in the city because of the radiation.[2] The place was called "America's Chernobyl" by some and prairie flowers grew on flash-burned rubble.


  1. The Long Earth - Chapter 51
  2. The Long War - Chapter 23
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