Buckinghamshire, extends from the Thames in the south and the suburbs of London in the southeast, across the high limestone ridges known as the Chiltern Hills, and from there through the fertile valleys and low sandy ridges of Aylesbury to the valley of the River Ouse (or Great Ouse) to the north. Within this region, administrative, geographic, and historical districts cover slightly different areas. The county is made up of his four districts: Aliceburyvale, Chiltern, South Bucks and Wycombe. The geographical county also includes the unified authority of Milton Keynes. Historic counties include the entire geographic county and unitary municipality of Slough, the northern Thames in the unitary municipalities of Windsor and Maidenhead, and the town of Linslade in the South Bedfordshire borough. Bedfordshire. Aylesbury is a county town (county seat). The landscape is diverse and before the 20th century this historic county was very rural. London's modern growth, underpinned by excellent road and rail links with the city, dominated his southernmost third of the county, creating a long ribbon of suburban development in the valleys of the Chiltern Hills. Commuter trains extend to Aylesbury and High Wycombe, some of London's wealthiest suburbs.
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