Newsminer.com in Alaska has a story about a hunter that was convicted of shooting a moose just inside the boundary of Denali National Park. The location of the park boundary and how well it was marked on the ground were important elements of the case.
I know from personal experience that United States National Forest Boundaries, Wilderness Boundaries, and National Park boundaries are not always well marked. I'm not making any determination of the hunter's guilt, I'm just pointing out my own personal experience with one issue in this case.
Goes to show that location matters.
Here is a link to the article: