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Early modern period
Main article: Early modern Britain
Further information: History of the United Kingdom
On 20 October 1604 King James, who had succeeded separately to the two thrones of England and Scotland, proclaimed himself "King of Great Brittaine, France, and Ireland".^[50] When James died in 1625 and the Privy Council of England was drafting the proclamation of the new king, Charles I, a Scottish peer, Thomas Erskine, 1st Earl of Kellie, succeeded in insisting that it use the phrase "King of Great Britain", which James had preferred, rather than King of Scotland and England (or vice versa).^[51] While that title was also used by some of James's successors, England and Scotland each remained legally separate countries, each with its own parliament, until 1707, when each parliament passed an Act of Union to ratify the Treaty of Union that had been agreed the previous year. This created a single kingdom with one parliament with effect from 1 May 1707. The Treaty of Union specified the name of the new all-island state as "Great Britain", while describing it as "One Kingdom" and "the United Kingdom". To most historians, therefore, the all-island state that existed between 1707 and 1800 is either "Great Britain" or the "Kingdom of Great Britain".
Geography
Further information: Geography of England, Geography of Scotland, and Geography of Wales
See also: Geography of the United Kingdom

View of Britain's coast from Cap Gris-Nez in northern France
Great Britain lies on the European continental shelf, part of the Eurasian Plate and off the north-west coast of continental Europe, separated from this European mainland by the North Sea and by the English Channel, which narrows to 34 km (18 nmi; 21 mi) at the Straits of Dover.^[52] It stretches over about ten degrees of latitude on its longer, north–south axis and covers 209,331 km² (80,823 sq mi), excluding the much smaller surrounding islands.^[53] The North Channel, Irish Sea, St George's Channel and Celtic Sea separate the island from the island of Ireland to its west.^[54] The island is since 1993 joined, via one structure, with continental Europe: the Channel Tunnel, the longest undersea rail tunnel in the world. The island is marked by low, rolling countryside in the east and south, while hills and mountains predominate in the western and northern regions. It is surrounded by over 1,000 smaller islands and islets. The greatest distance between two points is 968.0 km (601+¹⁄₂ mi) (between Land's End, Cornwall and John o' Groats, Caithness), 838 miles (1,349 km) by road.
The English Channel is thought to have been created between 450,000 and 180,000 years ago by two catastrophic glacial lake outburst floods caused by the breaching of the Weald-Artois Anticline, a ridge that held back a large proglacial lake, now submerged under the North Sea.^[55] Around 10,000 years ago, during the Devensian glaciation with its lower sea level, Great Britain was not an island, but an upland region of continental north-western Europe, lying partially underneath the Eurasian ice sheet. The sea level was about 120 metres (390 ft) lower than today, and the bed of the North Sea was dry and acted as a land bridge, now known as Doggerland, to the Continent. It is generally thought that as sea levels gradually rose after the end of the last glacial period of the current ice age, Doggerland reflooded cutting off what was the British peninsula from the European mainland by around 6500 BC.^[56]
Geology
Main article: Geology of Great Britain
Great Britain has been subject to a variety of plate tectonic processes over a very extended period of time. Changing latitude and sea levels have been important factors in the nature of sedimentary sequences, whilst successive continental collisions have affected its geological structure with major faulting and folding being a legacy of each orogeny (mountain-building period), often associated with volcanic activity and the metamorphism of existing rock sequences. As a result of this eventful geological history, the island shows a rich variety of landscapes.
The oldest rocks in Great Britain are the Lewisian gneisses, metamorphic rocks found in the far north west of the island and in the Hebrides (with a few small outcrops elsewhere), which date from at least 2,700 My ago. South of the gneisses are a complex mixture of rocks forming the North West Highlands and Grampian Highlands in Scotland. These are essentially the remains of folded sedimentary rocks that were deposited between 1,000 My and 670 My ago over the gneiss on what was then the floor of the Iapetus Ocean.
In the current era the north of the island is rising as a result of the weight of Devensian ice being lifted. Counterbalanced, the south and east is sinking, generally estimated at 1 mm (¹⁄₂₅ inch) per year, with the London area sinking at double this partly due to the continuing compaction of the recent clay deposits.
Fauna