The line will sail an eight-day Danube Delights cruise departing from Nuremberg and calling at Passau, Melk, Durnstein, Vienna and Bratislava and Budapest.
Emerald’s river cruise season also includes a "canoeing adventure” on Portugal’s Pinhao river.
To celebrate its Danube restart, Emerald is giving guests who book a 2021 sailing before 31 August a discount of up to £1,600 per couple and a complimentary Premium Drinks Package.