From the 1860s, the Great Western Railway provided a direct link to London Paddington. The Bishopric of Truro Act 1876 gave the town a bishop and later a cathedral. In 1877 it gained city status. The New Bridge Street drill hall was completed in the late 19th century. Geography Truro lies in the centre of western Cornwall, about from the south coast, at the confluence of the rivers Kenwyn and Allen, which combine as the Truro River – one of a series of waterways and drowned valleys leading into the River Fal and then the large natural harbour of Carrick Roads. The valleys form a steep bowl surrounding the city on the north, east and west, open to the Truro River in the south. This shape, along with high precipitation that swells the rivers and a spring tide in the River Fal, were major factors in the 1988 floods that seriously damaged the city centre. Since then, flood defences have been constructed, including an emergency dam at New Mill on the River Kenwyn and a tidal barrier on the Truro River. The city is amidst several protected natural areas such as the historic parklands at Pencalenick and areas of ornamental landscape such as Trelissick Garden and Tregothnan down the Truro River. An area south-east of the city, including Calenick Creek, has been included in the Cornwall Area of Outstanding Natural Beauty. Other protected zones include an Area of Great Landscape Value comprising farmland and wooded valleys to the north east, and Daubuz Moors, a local nature reserve by the River Allen, close to the city centre. Truro has mainly grown and developed round the historic city centre in a nuclear fashion along the slopes of the bowl valley, except for fast linear development along the A390 to the west, towards Threemilestone. As Truro grew, it encompassed other settlements as suburbs or districts, including Kenwyn and Moresk to the north, Trelander to the east, Newham to the south, and Highertown, Treliske and Gloweth to the west. Climate The Truro area, like the rest of Cornwall, has an oceanic climate. This means fewer extremes in temperature than elsewhere in England, marked by high rainfall, cool summers and mild winters with infrequent frosts. Demography and economy The Truro urban area, including parts of surrounding parishes, had a 2001 census population of 20,920. By 2011 the population, including Threemilestone, was 23,040. Its status as