The region of Mastikohória covers the entire southern part of the island from Armólia and comprises some twenty villages. This is where the lentisk grows; it is a bush about 2m high which is cupped for its resin, mastic, collected in the early autumn. Híos is the only place in the world where mastic solidifies naturally. Annual production varies between 200 and 300 tonnes. The charming Byzantine church of Panagía i Krína (12C or 13C) can be visited on the way.