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Vikings was renewed for a fourth season in March 2015 with an extended order of 20 episodes, which premiered on February 18, 2016. On March 17, 2016, History renewed Vikings for a fifth season of 20 episodes.
One expects that the answer to this question should be somewhere in Scandinavia. Nevertheless, all the seasons of Vikings have been filmed almost entirely in the Wicklow county of Ireland. Within a very short range near the studio you find rugged mountains, fairytale-like forests, gorgeous lakes and the seaside.