I found this photo today and it’s awesome. I wish I knew how long it took to complete. The stones look like river rock, but much larger than the ones I’ve seen at my local garden center. They could be flagstones now that I look at it again, obviously with a mix of boulders to serve as fence posts. I’m sure if you’ve been on Pinterest for awhile you’ve seen the stone mosaic walking paths but this seem to take that idea to another level difficulty and cool!