Shikkotsu Forest (湿骨林, Shikkotsurin; Literally meaning "Damp Bone Forest") is a legendary place that is equally famous as Mount Myōboku and Ryūchi Cave.
At some point after he integrated Orochimaru's DNA into his own body, Kabuto Yakushi went to the White Snake Sage. Under its tutelage, he learned senjutsu which enables him to use Sage Mode, which Orochimaru had also done in the past.
(This is all from Narutopedia.com)
If this "Shikkotsu Forest" is as sacred as Mount Myoboku and the Ryuchi Cave. It's a perfect place to practice and gather nature energy. As well as having a sage to preside over the area.
(Must Read here) I'm not saying this to try and bring up the possibilities of Sakura having sage mode. She can't on account that you need strong reserves of Chakra or else nature energy will easily take over.
At some point after he integrated Orochimaru's DNA into his own body, Kabuto Yakushi went to the White Snake Sage. Under its tutelage, he learned senjutsu which enables him to use Sage Mode, which Orochimaru had also done in the past.
(This is all from Narutopedia.com)
If this "Shikkotsu Forest" is as sacred as Mount Myoboku and the Ryuchi Cave. It's a perfect place to practice and gather nature energy. As well as having a sage to preside over the area.
(Must Read here) I'm not saying this to try and bring up the possibilities of Sakura having sage mode. She can't on account that you need strong reserves of Chakra or else nature energy will easily take over.