OK, it's tectonic time. I prepared a map visualizing Rautah's 18 tectonic plates based on this Wikipedia map. The symbols and colours are more or less the same:

- Arrows with numbers: plate direction and velocity with respect to East Nohhon (mm./year)
- Red lines: continental rift boundaries / oceanic spreading ridges
- Green lines: continental/oceanic transform faults
- Blue lines: continental/oceanic convergent boundaries
- Purple triangles: subduction zones

Click image for larger version. 

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I'm currently only concentrating on the plates and their movements. In a later phase I'll fill in the resulting islands/mountains/...

All comments are welcome. Does this map represent a plausible situation? Are there any inconsistencies? Flagrant mistakes? Did I overlook something crucial?

Thanks for having a look! Cheers, Akubra