That all tells Kate more than it does most. That people can travel easily to the perimeters, either by walking or by horse. By which will factor into how large the area is, but it is still going to be smaller than she'd like. Than would be comfortable.

"So," Kate says, thoughtfully, "there's a limited food supply. If there are animals about."

If not, then they are even more buggered. Supplies run out faster than game.