Item-gathering quests are probably my least favorite part of Final Fantasy 7 Rebirth, and Stuck in a Rut quest was one of them. If you're having trouble understanding the Wainwright's map, this guide is for you.
Gathering Materials for the Wainwright | Stuck in a Rut | Final Fantasy 7 Rebirth
While the Junon area is large, the area you need to search is not. Because while the map makes it seem like you need to race to the other side, the truth is that you don’t have to stray far from the far side. Here’s a comparison of the Wainwright map and the world map.
I didn't put an "X" on my map because the game shuffles the locations of buried treasure. The important thing is that these are the general areas. Your Chocobo will do the rest of the work.
Related: How to Prevent Enemies from Flying Up When Using Soothing Breeze in FF7 Rebirth