You can find Marari-in Shrine on Eventide Island, home of a pirate hideout.

Shrine Location

Marari-in Shrine is located in Eventide Island Cave, at 4634, -3713, 0018.

How to Reach the Shrine

You can only reach this shrine by completing the quest Seeking the Pirate Hideout.

Rauru's Blessing

The chest in this shrine contains a Ruby.