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
Genshin Impact - All 14 Precious Chests in (Tsurumi Island) Full Complete Detailed Guide - YouTube
Tsurumi Island Map and Puzzles Guide | Genshin Impact|Game8
Tsurumi Island Dig Site Buried Chest Location Genshin Impact - YouTube