 The latter can be subdivided (depending on soil, climate, and altitude) into regions dominated by the Norway Spruce, European Beech, and various species of Oak, together with less widespread vegetation types such as the Dinaric calcareous block fir forest.The Danube Delta is the largest continuous marshland in Europe.Vegetation in the marshland is dominated by reeds, with Willow, Poplar, Alder, and Oak on the higher ground.