Except in recently-developed Hokkaido, the original environment(characterized by natural forests)remaining in the Japanese archipelago is often found on holy mountains which were uesd since ancient times as objects of worship by the Shugendo religion.
The Japanese people had deified nature since ancient times, and after the introduction of Buddhist they came to view the gods and Buddha as one and the same. Mountain were thought of as holy places where the gods and Budda coexisted. These holy places were used for ascetic practices and the natural scenery was preserved in its natural state so that it would not be corrupted by worldly influences.
As evidence for these ideas, I have investigated and studied 1)remote mountain holy places such as Mt.Ohmine(Nara Prefecture)and Mt.Hiko(Fukuoka Prefecture), 2)village mountain holy places such as Mt.Kurokami(Saga Prefecture)and Mt.Yokokura(Kochi Prefecture), and 3)island holy places such as Kinkazon(Miyagi Prefecture), Miyajima(Hiroshima Prefecture), and Iojima(Kagoshima Prefecture), and I have shed light on the wisdom and skills of our ancestors, who protected nature according to strict standards.