Backcountry rangers Lydia Williams and Jordan Gibeault have almost reached their destination, Kephart Prong Shelter, when they purposefully veer off trail. They descend a slight hill, emerge into a small creekside clearing, and immediately turn their attention to a rocky outcrop protruding from the hillside. It’s ringed with stones and filled with ash. “This is a great example of an illegal fire ring,” Williams said. “Every time we come here, we’re dealing with it again and again.”