The Dotwood Tree is a location in the third chapter of Super Paper Mario (3-3 to be specific).
The level is fairly different from most of the others, as it requires Mario and co. to make their way upwards instead of to the right. After they make their halfway to the top of the tree, a separate set of puzzles awaits the crew inside the tree. Once at the top, a mini-boss fight with Dimentio is initiated. The level ends with Mario and Co. traveling on the red wind to Chapter 3-4, Fort Francis.