The Derhish language (Derhish: Gealêge) is a Celtic language spoken by about 300,000 people worldwide, most living in the Republic of Derhaland. The ISO 639-3 code by the language is DRC. It is closely related to the Irish language, and shares all of its sounds, although the pronunciation is simpler. It was originally formed in 2000 BCE as a fusion of various Celtic languages, although unlike them it contains a /z/ letter. Within a few centuries, communication with Ireland nearly merged the two languages naturally into a lingua franca. However, the geographical barriers kept the languages separate. Although the number of speakers was formerly declining, they are now slowly increasing with the total population of Derhaland since 1991. This is due in part to the fact that it can be understood by Irish speakers.