Somerton took over from Ilchester as the county town in the late thirteenth century, but it declined in importance and the status of county town transferred to Taunton about 1366. The county has two cities, Bath and Wells, and 30 towns (including the county town of Taunton, which has no town council but instead is the chief settlement of the county's only borough). The largest urban areas in terms of population are Bath, Weston-super-Mare, Taunton, Yeovil and Bridgwater. Many settlements developed because of their strategic importance in relation to geographical features, such as river crossings or valleys in ranges of hills. Examples include Axbridge on the River Axe, Castle Cary on the River Cary, North Petherton on the River Parrett, and Ilminster, where there was a crossing point on the River Isle. Midsomer Norton lies on the River Somer; while the Wellow Brook and the Fosse Way Roman road run through Radstock. Chard is the most southerly town in Somerset, and at an altitude of 121 m (397 ft) it is also the highest.