South of Chile Chico [1], a four-wheel-drive-only road parallels the border to Reserva Nacional Lago Jeinemeni, an infrequently visited protected area of 161,000 hectares. There is little infrastructure except a campground (US$4); Conaf rangers collect US$1 admission.
Links:
[1] http://www.moon.com/destinations/chile/northern-patagonia/-southern-carretera-austral/chile-chico