Carnival Corp has confirmed offloading four Holland America Line ships without naming the buyers as part of a plan to reduce its fleet by 13 vessels.

Bonheur announced buying two ships from the Carnival brand on Wednesday for its subsidiary Fred Olsen Cruise Lines, disclosing only their ages, weights and passenger capacities.

TradeWinds was able to identify them as 1,380-berth Amsterdam (built 2000) and 1,404-berth Rotterdam (built 1997) using Clarksons data.