The urban area of Rennes has a superficy of 2,542 km2 but densities differ a lot between the city core (4125 inhabitants/km2), the outer urban ring (283 inhabi-tants/km2), and the hinterland (81 inhabitants/km2).
This urban area can be also characterised by an historic tradition of
politics partner-ship between mayors of the different towns in the metropolitan
area. The regional administrative entity is a public cooperative body
combining 33 administrative units, with a population of 320,000 (1990
general population census). It is now in charge, among others, of public
transport and urban planning.