The South East Dorset conurbation (also known as the South Dorset conurbation, Poole-Bournemouth urban area and Bournemouth urban area) is a multi-centred conurbation on the south coast of Dorset in England. Extent The main population centres are Bournemouth, Christchurch, and Poole which are served by the single unitary authority of Bournemouth, Christchurch and Poole. However, the urbanised area spreads into the area of the Dorset unitary authority and into the New Forest District as far east as Barton on Sea. There are a number of satellite towns peripheral to the urban centres, including (listed clockwise) Wareham, Verwood, and Ringwood (Hampshire). The urban area is generally surrounded by a green belt. In 2006, the South West England Regional Development Agency and the Highways Agency, which maintains England's trunk roads, defined a South East Dorset Conurbation with over 400,000 people. The term has also been applied to the Bournemouth, Christchurch and Poole boroughs, excluding the surrounding towns, for example, in their 2006 Joint Local Transport Plan. The conurbation is the largest urban area in Britain with no part having city status. Population The 2011 census gave a population of 466,626 for the conurbation, defined by the Office for National Statistics as the Bournemouth/Poole Built-up Area, and divided it into six main parts: Bournemouth, Ferndown, Wimborne Minster, Christchurch, New Milton, and Poole. The population of the conurbation increased significantly between the 2001 and 2011 censuses, mainly because the towns of Ferndown and Wimborne Minster became part of it. The population for the conurbation according to the 2001 and 1991 censuses was 383,713 and 358,321, respectively. Nearby places There are a number of nearby towns and villages that are separated from the conurbation by narrow gaps. They include: Bransgore Corfe Mullen Lytchett Matravers Lymington Milford on Sea Ringwood St Ives St Leonards Verwood West Moors Transport The conurbation is served by a number of main roads. The M27 motorway feeds the M3 to London and ends on the eastern edge of the New Forest near Southampton, but extends west as the A31 trunk road. The A31 serves as a bypass for the conurbation, north of Poole and Bournemouth but south of many of the satellite towns, and is dual carriageway for most of its length. To the west the A31 merges with the A35 at Bere Regis where they continue west to Dorchester and Exeter. The A35 runs through the centres of the main