The Spring of Power is a location from The Legend of Zelda: Breath of the Wild. It is located in the Deep Akkala region of Hyrule, west of the East Akkala Stable. The Mark of Din appears on the alter the Goddess Statue sits upon.
The general layout of the Spring of Power is very similar to the Earth and Skyview Springs from Skyward Sword, although the Spring of Power is in a more ruined state. It also serves a similar purpose as Princess Zelda visits it to purify herself and pray to Hylia to awaken her powers, like in Skyward Sword.