I would like to see this implemented.

In the meantime, if you'd like to remember where they are, the PrntScrn function works quite well for this.
Hit the PrntScrn key and then Ctrl+V in paint or the like. Instant location saved.

If on mobile, take a screenshot of the map. It shall be saved.

Clarification and comment.

The evil wells that are already explored!
No changes in the game mechanic or market mechanics! Nobody will have any lost here!

The game was always good as it was and is!
People play this game for the Guild(gps) and the skilling makes them continue or other reasons!
For all that likes screenshots they can use that to see where the explored wells are, but usually this is laborious!

A kind of cosmetic yes, but in fact it is a bug that happends after every disconnect or refreshing.

If you ever find time take a look on this, it would be nice!

I just take a screenshot when I find one...