122801d3__Link_Between_Worlds__and_more__Directions_and_Notes
[Holes] 14 [Location] Hyrule Field [Requirements] Megaton Hammer [Directions and Notes] 
In an area to the left of the castle with a river that flows out of one wall and empties through a grate into another, go across the river and use the Megaton Hammer to smash the boulder. Inside the hole is a Fairy Fountain.
The Legend of Zelda: Ocarina of Time Secrets - Zeldapedia, the Legend of Zelda wiki - Twilight Princess, Ocarina of Time, A Link Between Worlds, and more
Directions and Notes