Hidden Tsurumi Island Chests you may have missed as of 2.2 [Genshin Impact][2.2] - YouTube
How to Find Genshin Impact Secret Chests: A Map & Location List
A precious chest in Shirikoro peak (Tsurumi Island), just there, no puzzle, no enemies, its just there (I was kinda suspicious at first, but it is real lol, still can't believe it
Where to find all Remarkable Chests on Tsurumi Island in Genshin Impact - Pro Game Guides