Tahno O'ah Shrine is a blessing Shrine from The Legend of Zelda: Breath of the Wild. It's the subject of the shrine quest Secret of the Cedars. Tahno O'ah rewards Link with a Spirit Orb on completion. A chest inside the shrine contains the Climbing Boots.
The shrine is found in a hidden cave on Mount Lanayru in eastern Hyrule. The cave is east of Madorna Mountain, about halfway to the coast. The trees just outside of the entrance make for a good landmark.