Info
The circled area in images on the right may not be the exact location of the chest but in the general area, it should not be too far off and typically exactly where you should dig. Some other things to look out for are ones that are in caves, I do not list if they are but by the pictures you should be able to tell. If you are unsure how to get inside of these caves there are many tutorials on YouTube.
This website is still in development and better pictures are coming every day. I take every screenshot myself and take new ones with the chest in it when I get said riddle.