I found a treasure map, went to the X and dug a pretty wide hole in the sand, which is about 5 blocks deep, but I have not found anything, how and where to dig to find the treasures?
I recommend a 25 * 25 wide and 15 min deep hole ^^
If you are desperate, you can enter this command:
/ locate Buried_Treasure
Just put it near it and enter it. Wait a moment and click on the green text that appears in the chat and press enter.
Hope that helps you!