The North Circular Road (officially the A406 and sometimes known as simply the North Circular) is a 25.7-mile-long (41.4 km) ring road around the northern half of inner London. It runs from Chiswick in the west to North Woolwich in the east via suburban north London, connecting various suburbs and other trunk roads in the region.
Together with its counterpart, the South Circular Road, it mostly forms a ring road around inner London, except for crossing of the River Thames, which is done by the Woolwich Ferry.