Wallachian Plain
Beyond the Carpathian foothills and tablelands, the plains spread south and west. In the southern parts of the country, the lower Danube Plain is divided by the Olt River; east of the river lies the Wallachian Plain, and to the west is the Oltenian or Western Plain. The land here is rich with chernozemic soils and forms Romania's most important farming region. Irrigation is widely used, and marshlands in the Danube's floodplain have been diked and drained to provide additional tillable land.