La Roche-Derrien is a former commune in the Côtes-d'Armor department of Brittany in northwestern France. On 1 January 2019, it was merged into the new commune La Roche-Jaudy.
Wikipedia https://en.wikipedia.org/wiki/La_Roche-Derrien
Coordinates 48°44'45.689" N -3°15'42.514" E
