<P> It consists of the low plains between the Hercynian Europe (Central European Highlands) to the south and coastlines of the North Sea and the Baltic Sea to the north . These two seas are separated by the Jutland Peninsula (Denmark). The North European Plain is connected to East European Plain, together forming the European Plain . </P> <P> The Northern European Plain's main use is commercial farming, with little natural vegetation remaining . </P> <P> Elevations vary between 0 and 200 m (about 0 to 650 ft). While mostly used as farmland, the region also contains bogs, heath and lakes . On the North Sea coast one finds the Wadden Sea, a large tidal area . </P> <P> On the Baltic Sea coast one finds the Szczecin Lagoon, the Vistula Lagoon and the Curonian Lagoon, a number of large freshwater lagoons . </P>

Which of the following formed the basis of a common material culture in the northern european plain