Upon further investigation…
Thank you for your concern however. Always good to check these things.
Oh, that one is tagged hax because that is what I tag gifs that are made using some sort of angle, feature, glitch, etc. that you would not see in normal gameplay.
As for that particular gif it’s the fishing place in Lake Hylia.
You can go there as either young or adult Link. If you go as adult Link and you haven’t beaten the Water Temple yet, you’ll need the Scarecrow’s Song and the Hookshot/Longshot to get in.
It’s a good thing you specified what you haven’t seen or I might be really confused.