High Quality Content by WIKIPEDIA articles! Stena Line is one of the world`s largest ferry operators, with ferry services serving Scotland, Sweden, Northern Ireland, Denmark, Norway, England, Wales, Ireland, Germany, the Netherlands and Poland. Stena Line is a major unit of Stena AB, itself a part of the Stena Sphere, a grouping of Stena AB, Stena Metall AB and Stena Sessan AB. Stena Line also owns the Swedish vessels of the otherwise German- and Danish-owned Scandlines.