Dârjiu is a commune in Harghita County, Romania. It lies in the Székely Land, an ethno-cultural region in eastern Transylvania. The commun…Dârjiu is a commune in Harghita County, Romania. It lies in the Székely Land, an ethno-cultural region in eastern Transylvania. The commune is composed of two villages, Dârjiu and Mujna, both of which are on the route of the Via Transilvanica long-distance trail.