Visitors to a national recreation area straddling the Arizona-Utah border are being asked to stay away from a rock art site that features sheep carved thousands of years ago.

The petroglyph panel is along the Colorado River between Glen Canyon Dam and Lees Ferry. It falls within the Glen Canyon National Recreation Area.

While officials would like people to keep away from the site in January and February to protect it from vandalism, a voluntary closure means no one will be fined or cited for going to it.