There's a reservoir of water splitting off from the Zora's domain route in OOT. Navi then focuses on part of the water suggesting the player can get something. I've tried all the songs, tried bombs, tried everything I can think of. What's up with this tiny lake?
I remember being frustrated about that spot as a kid. I don't think anything is actually there. MAybe something was there during development but the devs forgot to remove navi's action.