Joannas is a commune in the Ardèche department in southern France. There are two castles at Joannas: the castle of Logères was built in t…Joannas is a commune in the Ardèche department in southern France. There are two castles at Joannas: the castle of Logères was built in the 12th century. The castle of Joannas which contains the town hall, was inscribed in 1985 as an historical monument.