It's easy if you know the battle, as you clearly do. I'd have probably given it to a guess of "Battle for Little Round Top", but Devils Den was what I was looking for. The boulders are unmistakable.
Many years ago I visited the battlefield, by myself, in late May. I'd fought the battle hundreds of times with AH's board game(s) so knew the terrain well (from a game board map POV). Weather was warm, but humidity was down so it was mostly pleasant. Walked it for three days from 6-to-6, consulting my then-and-now photo book. Was disappointed occasionally as the underbrush in places was extremely heavy and overgrown way out of proportion to 1863. For example, a lot of Culp's Hill was simply inaccessible.
Stood in most of the famous places and some less so. I wanted to see them for LOS from game playing. LOL. Walked the length of the field of "Pickett's Charge" up to "the Angle" and the "Copse of Trees ". I stood in line with the 20th Maine and took a handful of water from Plum Run.
What an extraordinary experience. I remember it like it was yesterday.