"I always like going South, somehow it feels like going downhill" - Treebeard

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Disclaimer - I don't actually know if you're going south, but it is downhill!

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Head down the Southern Pass. There's some really tall trees here, like mahoooooosive. When you get the driveway on your right, look up. Then look further up. 

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How did Pumbaa get up there?! This is the next password.