Calavon or Coulon?

The Calavon is also called Coulon downstream of Apt. The geographical limits of use of the name Coulon is set here in the Commune of Goult where one of its tributaries reaches upstream of the bridge: L'Imergue. Spelled "Limergue" until the early 20th century, it comes the Latin word "Limés" which means the limit. This river was considered, from late Antiquity to the Middle Ages, as a border between the two influencial linguistic areas and the Contat Venaissin.