Princess Eleganza is currently undergoing a refurbishment ahead of its inaugural sailing on 13 May 2022.
The 47-metre long yacht, which can accomodate 36 guests in 19 ensuite cabins, will sail two new itineraries.
The eight-day Croatian Island Adventure sailing, from Split to Dubrovnik, will run from May until September 2022 with calls in Dubrovnik, Korcula, Hvar, Split, Brac and Vis. Prices start from £1,995pp.
A 10-day Coast Croatia itinerary, from Dubrovnik to Opatija, calls at Korcula, Hvar, Split, Sibenik and Zadar and costs £2,495pp.
Paul Melinis, managing director of APT, said the "appetite" from the line’s customers for Croatian sailings has "exceeded all of our expectations".
"With much of the original capacity on our Adriatic Coastal Cruise itinerary aboard our custom newbuild, the Lady Eleganza, sold out for 2022, we have decided to increase our volume in Croatia to meet demand.
"We are delighted to welcome her sister ship, the Princess Eleganza, to our fleet for 2022, and to offer guests a further two itineraries in this spectacular sailing region next year."