Back of the interior.
East side of the island.
Unnamed Islands in the Sky
In the interior of the volcano-esque island to the south of Skyloft.
Behind the temple, within the clearing.
Outside the Ancient Cistern, along the path back to the Faron Woods (not to the inside of the caverns!).
Atop the high ledge found to the west of the entrance to the Earth Temple.
Get to the ledge above the water spring outdoors.
Inside the room with the second of the frog statues that you poured water into, heading towards the Fire Sanctuary entrance.
Practically in the middle of the main room.