Yes, its the Life-Guiding Tree Kanako was so "wise" to root in Gensokyo in the events of the FAN GAME: Mystical Power Plant. I do understand that it isn't a canon game or story but it IS one of the best ones out there and can fit in an actual canon location as well. As it stands, it's still just a suggestion but most would love to see this in the world.
If this IS considered, I would not mind taking screenshots of the different sanctums of the tree. I don't think there's a good picture of it so interpret to the best.