The Costarmoricaine is a long distance race for Formula 18 and Viper catamarans. It covers all Côtes-d'Armor (Brittany, France) coats. It is yearly organized by the Club de Voile de la Baie d'Erquy.

This year, the Costarmoricaine is again part of the French long distance race championship.

The first Costarmoricaine has been held in 1993. The 2012 event will be the 18^th. (there was no Costarmoricaine in 1997 because of the European championship, neither in 2000 due to the first World F18 Championship)