Viking Line Abp is a Finnish shipping company that operates a fleet of ferries and cruiseferries between Finland, the Åland Islands, Sweden and Estonia. Viking Line shares are quoted on the Helsinki Stock Exchange. Viking Line is operated from Åland.

Celestyal Crystal is a cruise ship, operated between 2007 and 2023 by the Cyprus-based Louis Group's Louis Cruise Lines and Celestyal Cruises. The ship was originally built as the cruiseferry Viking Saga in the 1980 at Wärtsilä Perno Shipyard and Turku Shipyard, Turku, Finland for Rederi Ab Sally. In 1986 she was renamed Sally Albatross, and rebuilt into a cruise ship the following year. The ship was destroyed by a fire in 1990, and completely rebuilt at Finnyards, Rauma, Finland. She was re-delivered in 1992, still named Sally Albatross. After partially sinking 1994 she was rebuilt at Industrie Navali Meccaniche Affini, La Spezia, Italy, re-entering service as Leeward for Norwegian Cruise Line. Subsequently she sailed as SuperStar Taurus for Star Cruises, Silja Opera for Silja Line. After being temporarily renamed Opera she was in service with Louis Group as Louis Cristal and later Celestyal Crystal.