Personable Carlos is an enthusiastic Chaco expert and offers memorable 4WD tours that get right into the heart of the Impenetrable region, both geographically and culturally. The standout trip is a two-day affair that eschews roads in favor of tracks and visits indigenous communities, remote settlements, reserves and national parks. Day trips and excursions camping on ranches are also possible.

Carlos also runs a hotel on the banks of the River Teuqo in Bermejito to the north of Castelli. If the office isn't open ask in the stationery shop on the corner.