Better Link:
http://www.flamestryke.com/wizardry8...trykes_w8.html
click on Trynnton on the map picture.
Or follow this hint and spoiler:
If you're standing facing the door with the blue indentation "that leads to the 7th bough" turn around and go back to the nearest four-way intersection and look at your auto-map to see where you haven't been yet. You can go back to the Zoo from here, or to the Rattkin area, or Madras.
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Madras is uphill, to the North, of this 4-way.