Kemono no Tani

 Beast Valley is a location in the Jurassic era, in the Inazuma Eleven GO Chrono Stone series.

Info (Chrono Stone)
This is the main location in the Jurassic era for Raimon. Raimon came to this period to find power's #6 and #7 for the Hasha no Seiten. Many dinosaurs live here aswell as Tobu's home being somewhere upon a mountain.

Cave
Deep into Beast Valley, there is a cave which Rockstar and Big live in. In episode 31, Rei Rukh appeared, and used his Sphere Device to mind-control Rockstar.