Mount Koryū (古流山, Koryūzan, Literally meaning: Ancient Flow Mountain) is the main location appearing in the Naruto Shippūden: Dragon Blade Chronicles. It's formed into four elemental areas. There is a ritual temple in the middle of the mountain.
The area in and around Mount Koryū interferes with normal chakra use. Because of this, outfits specifically made to counter this effect are worn by Naruto and his companions.