Which river might eastern europeans use to transport goods to scandinavia?

River Oder is a river of central Europe that Originates from the north East of Czech republic which then flows through Poland along the Poland-German border and drains to the Baltic sea. The river is an important water way in eastern and central Europe and might have been used by eastern Europeans to transport goods to Scandinavia (a region in Northern Europe). Barges on the river are observed to carry, iron, coke and coal.