The ancient water spirit Jabun lived for many ages at Greatfish Isle. Something wicked occurred, and now Jabun is nowhere to be found. Still, the place holds several items of interest.
Beedle’s Shop Ship
Enter Beedle’s Shop Ship to purchase items. Here he sells 30 arrows for 60 Rupees, 30 bombs for 60 Rupees, and a Red Potion for 30 Rupees.
Rings of Light
Four rings of light around this island appear only under the light of a full moon. Use the Grappling Hook to pull a chest containing a Red Rupee from each one.
Piece of Heart #17
This Piece of Heart is in a chest in a shallow cave (not a Secret Cave) on the side of the isle. To reach the chest, climb to the top of the southeast isle’s corkscrew-like path, to a Withered Deku Tree. Play the “Wind’s Requiem” to direct the wind northwest, then use the Deku Leaf to glide toward the middle of the two large islands ahead.
On the island to the right is a small ledge. Land here to discover a shallow cave with a treasure chest that contains Piece of Heart #17.
Traveling Merchant
After you begin the trading quest side quest at Windfall Island (D2), three Traveling Merchants appear on three islands of the Great Sea. One is here at Greatfish Isle, on a small raft on the island’s west side.
Triforce Shard #7
After finding, opening, and paying Tingle 398 Rupees to decipher Triforce Chart #1 (found at the Islet of Steel [B5]), you can pull a chest from the Great Sea near Greatfish Isle. The chest contains Triforce Shard #7.