From the Super Mario Wiki
Boggly Woods are the woods which Mario, Goombella and Koops explore in Paper Mario: The Thousand-Year Door, in Chapter 2. These woods seem tranquil, yet they create an eerie and lonely atmosphere accentuated by large gusts of wind and shifting, rainbow-colored earth. The Boggly Woods are inhabited by many pale black-and-white enemies and the Punies, small gray creatures with colored pompoms on their heads. Because of their remote location, the woods also attract a few Rogueportians who desire peace and solitude. Two notable non-Bogglians are Madame Flurrie, one of Mario's partners, and Doe T., one of the subjects Mario must help from the Trouble Center.
Mario and his teammates discover that the X-Nauts are behind Princess Peach's kidnapping and offer Punio their help in driving the X-Nauts out of the Punis' home, the Great Tree. As the group nears the woods, they happen to hear the Shadow Sirens in the midst of conversation as they try to recover a lost sketch of Mario they believe will lead to his capture. During this, Vivian shows Beldam Flurrie's necklace. Marilyn notices Mario as he enters the woods and tries to alert her sisters, but Beldam and Vivian ignore her.
Before Mario reaches the Great Tree, he encounters the aforementioned Madame Flurrie and learns that she lives in Boggly Woods not only for peace and solitude but also to be near the Punies, who she adores. She requests help in retrieving her necklace, which Mario and his companions find in the woods, and once it is in her possession, Madame Flurrie joins their quest and uses her abilities to help the group gain access to the Great Tree.
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