Primarily County Wicklow, Ireland (doubling as frozen Eastern European rivers).
High-scale practical effects were used, including a 3.5-ton boat pulled by horses and 3,500 meters of concrete laid to simulate a frozen river. Plot Arcs & Narratives Vikings: Valhalla - Season 2
The season is characterized by its "blown out" scope, moving beyond the fjords of Scandinavia into a much larger 11th-century world. Primarily County Wicklow