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Bristol Geography

Boundaries

There are a number of different ways in which Bristol's boundaries are defined, depending on whether the boundaries attempt to define the city, the built-up area, or the wider "Greater Bristol". The narrowest definition of the city is the city council boundary, which takes in a large section of the Severn Estuary west as far as, but not including, the islands of Steep Holm and Flat Holm.  A slightly less narrow definition is used by the Office for National Statistics (ONS); this includes built-up areas which adjoin Bristol but are not within the city council boundary, such as Whitchurch village, Filton, Patchway, Bradley Stoke, and excludes non-built-up areas within the city council boundary. The ONS has also defined an area called the "Bristol Urban Area," which includes Kingswood, Mangotsfield, Stoke Gifford, Winterbourne, Frampton Cotterell, Almondsbury and Easton-in-Gordano. The term "Greater Bristol", used for example by the Government Office of the South West, usually refers to the area occupied by the city and parts of the three neighbouring local authorities (Bath and North East Somerset, North Somerset and South Gloucestershire), an area sometimes also known as the "former Avon area" or the "West of England".

River flowing though a steep sided valley. In the distance is a suspension bridge supported by towers. In the left foreground is a handrail.

Physical geography

Bristol is in a limestone area, which runs from the Mendip Hills to the south and the Cotswolds to the north east. The rivers Avon and Frome cut through this limestone to the underlying clays, creating Bristol's characteristic hilly landscape. The Avon flows from Bath in the east, through flood plains and areas which were marshy before the growth of the city. To the west the Avon has cut through the limestone to form the Avon Gorge, partly aided by glacial meltwater after the last ice age.[80] The gorge helped to protect Bristol Harbour, and has been quarried for stone to build the city. The land surrounding the gorge has been protected from development, as The Downs and Leigh Woods. The gorge and estuary of the Avon form the county's boundary with North Somerset, and the river flows into the Severn Estuary at Avonmouth. There is another gorge in the city, in the Blaise Castle estate to the north.
Sapa voyage
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