Even if it has not a legal status yet, the Bucharest Metropolitan Area (BMA) project is in an advanced preparation phase, already producing effects in the real economy. Conventionally, BMA imbeds the entire Ilfov county (which surrounds it and form together the Bucharest-Ilfov region (NUTS 2)) as well as localities from other four counties of the South - Muntenia region (also NUTS 2). As Bucharest-Ilfov region appears as an enclave within South-Muntenia region, in a broader view it is considered that BMA influences all seven surrounding counties belonging to the South-Muntenia region. This region as a whole (apart from the localities of the four counties that are to be incorporated in the metropolitan area) plus Bucharest MA are viewed as the Bucharest metropolitan region, in other words the South-Muntenia region is the BMA external hinterland. In technical terms, the metropolitan area is a zone of direct city impact in which the relationships are strong and permanent (functional urban area, internal hinterland zone) whereas the metropolitan region is a zone in which the relationships are weaker, but the area is under the core city influence (macroregion, external hinterland zone). One of the main debates around BMA and metropolitan region refers to the effects of the BMA on its external hinterland, South-Muntenia region, by far less developed: are they / will they be spread or rather backwash effects? Our paper addresses this question focusing on a series of issues such as: examples of links between BMA and surrounding region, examples of positive and negative influences of the metropolis on its surrounding region, changes in regional settlement system and its drivers, changes in regional production system and main drivers, labour commuting patterns and drivers, policies with significant impact on metropolis ? region relationship, how external interventions address the needs of the metropolitan area and its external hinterland, to what extent the metropolitan area can contribute to the external hinterland regeneration, etc. The paper is the result of the research undertaken within the GRINCOH FP7 project.
