
Devon (/ˈdɛvən/ DEV-ən; historically also known as Devonshire /-ʃɪər, -ʃər/ -sheer, -shər) is a ceremonial county in South West England. It is bordered by the Bristol Channel to the north, Somerset and Dorset to the east, the English Channel to the south, and Cornwall to the west. The city of Plymouth is the largest settlement.
Devon has a varied geography. It contains Dartmoor and part of Exmoor, two upland moors that are the source of most of the county's rivers, including the Taw, Dart, and Exe. The longest river in the county is the Tamar, which forms most of the border with Cornwall and rises in Devon's northwest hills. The southeast coast is part of the Jurassic Coast World Heritage Site, and characterised by tall cliffs that reveal the Triassic, Jurassic and Cretaceous geology of the region. The county gives its name to the Devonian geologic period, which includes the slates and sandstones of the north coast. Dartmoor and Exmoor have been designated national parks, and the county also contains, in whole or in part, five national landscapes. High Willhays (Dartmoor national park) is broadly recognised as the most southernly nuttall/hewitt mountain in the United Kingdom, standing at 621 m/ 2039 ft above sea level.
In the Iron Age, Roman and the Sub-Roman periods, the county was the home of the Dumnonii Celtic Britons. The Anglo-Saxon settlement of Britain resulted in the partial assimilation of Dumnonia into the kingdom of Wessex in the eighth and ninth centuries, and the western boundary with Cornwall was set at the Tamar by king Æthelstan in 936. (Full article...)
The Blackdown Hills, or Blackdowns, are a range of hills along the Somerset–Devon border in south-western England. The plateau is dominated by hard chert bands of Upper Greensand with some remnants of chalk, and is cut through by river valleys.
The Blackdown Hills were designated in 1991 as an Area of Outstanding Natural Beauty (AONB). In November 2023, AONBs became National Landscapes. The hills support an extensive range of wildlife leading to the designation of 16 Sites of Special Scientific Interest (SSSIs).
There is evidence of human occupation since the Iron Age. Fortifications include the remains of ancient hill forts, Norman motte-and-bailey castles and Second World War airfields. There are also religious buildings such as Dunkeswell Abbey and village churches. The hills are crossed by a network of minor roads, and major transport routes including the M5 motorway run around the periphery. (Full article...)

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