The Volturno alluvial-coastal plain is a relevant feature of the Tyrrhenian side of southern Italy. Its plan-view squared shape is due to Pliocene-Quaternary block-faulting of the western flank of the chain. The Quaternary infill of the Volturno plain has been here studied by means of well data. An asymmetrical shape of its ancient morphology - with a steeper slope toward the north-west border - and the lack of coincidence between the present course of the Volturno River and the main buried bedrock incision are significant achievements of this study. Landforms analysis completed the frame of the recent evolution of the plain