Tree Felling Village

The Tree Felling Village is a peaceful town controlled by the dark demon, Black Shadow, who protects the village in exchange for human sacrifices they used to have the "Tree of Life", which was then cut down by their ancestors.

Black Shadow
A powerful, immortal beast whose only weakness is the leaves on the Tree of Life and domains in the Crystal Cave which villagers get their products but because of him the villagers were having a hard time mining and selling their products, His true form is a black fox with numeruos tails, two snouts, five eyes and six legs, it was later then killed by Naruto and the Nine tails

The Tree of Life
It is the all powerful Tree of Life which leaves keeps Black Shadow sealed in the caves and its leaves can cure any disease just like it healed Aoi's mother, Tsubaki. And one of its remaining leaves are in Aoi's necklace.

Trivia

 * The Tree Felling Village is now called the The Tree Reviving Village because of Black Shadow's death.