"In the Languedoc region" was translated as "dans le Launguedoc".  I followed this example to translate "in the Gironde region" but it was marked wrong and the correct translation provided was "en Gironde".  In some cases a name is used with an article - as above, for example, or also in this exercise "la presqu'ile du Medoc" but "la plage.. de Port-Leucate".  Are there rules about how to refer to different places? Thank you.