Siberia West 4, Earth West 4, was a low earth footprint. It was the location of a secret Black Corporation facility, where the first twain, the Mark Twain was built and launched from.

This version of Siberia was 2 degrees warmer, for an unknown reason. This area of this world was covered in pine woodland.[1]

The Long Earth

Joshua Valienté came here in 2030, before the Journey, and was greeted by a Russian woman and a man. It was raining. He was directed to follow a line of orange markers to the construction site of the Mark Twain, where it floated, teathered to the ground by wires, in the middle of a clearing. He met another man here, who took him up an elevator into the airship.[1]


  1. 1.0 1.1 The Long Earth - Chapter 12

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