Shhwonk Fortress is a fortress in Paper Mario: The Thousand-Year Door where the Moon Stone and the Sun Stone are kept. It is beyond Petalburg and a few smaller stone fortresses. The Stone Keys found inside are used to open the pipe to Hooktail Castle. They say that long ago, Shhwonk Fortress was a place of relief from monster invasions for Petalburg residents. Past this, however, monsters invaded the fortress, and since then, traversing to them was actually outlawed without permission from Kroop. The fortress is estimated to be about a thousand years old, the same date of the The Thousand-Year Door.

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