Tullnerfeld Plain, Lower Austria, southern part of the Tulln Basin, a fertile alluvial plain on both banks of the Danube extending along the Wachau Valley (Krems) and Korneuburg and along the northern fringe of the Vienna Woods, the alpine foreland and the Wagram, part of the Molasse zone, with a wide wetland area of about 5 km on either side of the Danube; the Tullnerfeld Plain is 48 km long and 14 km wide. The Tulln Basin is a wide plain along the Danube; it is a settled ground filled with tertiary sediments and rubbly deposits of the Danube and rivers of the alpine foreland. When the Danube was regulated new, fertile land was formed; as the rivers slowly cut into the gravel bed the terraces peculiar to this landscape were formed. There is intensive farming on these wide, fertile terraces (wheat, maize, potatoes and sugar beet). The main town is Tulln an der Donau, the town of Stockerau lies at the northeastern fringe of the Tulln Plain; the main power supply stations are the Donaukraftwerke near Altenwoerth and Greifenstein and the thermal power stations Duernrohr and Theiss. During the Second World War there was a large oil refinery in Moosbierbaum; the nuclear power station in Zwentendorf has never been put into operation. Tributaries of the Danube in the south are: the Rivers Traisen, Perschling, Grosse Tulln and Kleine Tulln, in the north Kamp, Schmida and Goellersbach. Two climatic zones meet in the Tulln plain: the Central European-oceanic climate and the dry, more continental type of climate.