Well...in agceep correctly there is the event of the loss of ferrara so in 1597/1599 Modena losed the fleet but in 1755 there was the wedding with the duchess of massa (it is in tuscany) and again modena could reach the sea 
is there a way to make emilia (in eu2) and romagna(agceep) before 1597 and after 1755 a costal province?
is there a way to make emilia (in eu2) and romagna(agceep) before 1597 and after 1755 a costal province?