United Kingdom Geography, Climate & Nature

The United Kingdom comprises the island of Great Britain, the north-east of Ireland and several hundred smaller islands, covering about 244,000 square kilometres. No point in the country is more than about 125 kilometres from tidal water.

The highland-lowland divide

A line running roughly from the Exe to the Tees separates the two halves of Britain. South and east of it the land is lowland, rolling and built on younger, softer rock — chalk downs, clay vales and the Fens, which are drained wetland below sea level. North and west the rock is older and harder, and the land rises into the Pennines, the Lake District, the Welsh mountains and the Scottish Highlands.

The Highlands

Scotland north of the Highland Boundary Fault holds the highest and emptiest country in the UK, with Ben Nevis at 1,345 metres and glens carved by ice. Glen Mor cuts the Highlands in two along a fault line, holding Loch Ness among others.

Coast

The coastline is extraordinarily long for the land area — deeply indented, with sea lochs, rias, chalk cliffs, sand dunes and the Giant’s Causeway’s basalt columns in Antrim. Cornwall, Pembrokeshire and the Scottish west are the most dramatic stretches.

Islands

The Hebrides, Orkney and Shetland off Scotland; Anglesey off Wales; the Isles of Scilly and Wight off England. Orkney holds Neolithic monuments older than Stonehenge.

A worked landscape

Almost nothing here is wild. The hedgerows, field patterns, moorland and even the treeless Highlands are the result of several thousand years of clearance, farming and grazing — which is itself the interest of it.

The UK has a temperate maritime climate, kept far milder than its latitude by the Atlantic and the North Atlantic Drift — the country sits as far north as Labrador and Moscow and sees nothing like their winters.

A narrow range

Winter averages 2 to 8°C and summer 16 to 22°C across most of the country. Temperatures above 30°C make the news; the record of 40°C, set in 2022, was a national first and the infrastructure did not cope well with it. Snow falls most winters and lies mainly in the north and on high ground.

Wetter in the west

The prevailing wind is from the south-west, so the western side takes the rain first. The Lake District and the western Highlands exceed three metres a year in places, while parts of Essex and Cambridgeshire get under 600 millimetres — drier than some Mediterranean cities. London is drier than Rome, a fact Londoners enjoy.

Changeability

Atlantic fronts cross every few days, so conditions change within hours and forecasts beyond three days are approximate. Four seasons in a day is a cliche because it is accurate, and it is why the weather is a permanent topic of conversation.

Light

The latitude produces long summer evenings — light until eleven in northern Scotland in June — and short winter days, dark by half past three in December in the far north. This affects a winter itinerary more than the temperature does.

Storms

Named Atlantic storms between October and March bring damaging winds, coastal flooding and travel disruption, and the Met Office warning system is colour-coded and worth following.

The British Isles were separated from continental Europe only after the last glaciation, and the ecological consequence is a country with relatively few species and a great many of them at the edge of their range. What Britain has instead of variety is habitat that exists nowhere else in the same form: blanket bog across the Scottish Flow Country and the Pennines, chalk grassland on the southern downs, Atlantic oak woodland on the western seaboard, and machair on the Hebridean coast.

Almost all of it is managed. British "wild" landscape is largely the product of several thousand years of grazing, burning and drainage -- the uplands are treeless because sheep and deer keep them so, and the heather moors are maintained for grouse. This makes conservation here an argument about management rather than protection, which is the background to the rewilding projects now running on estates in Scotland, Wales and southern England.

The marine environment is the under-appreciated half. British waters hold cold-water reefs, kelp forest and one of Europe's most important seabird assemblages, and the coast is where the country's biodiversity is genuinely internationally significant.

Britain's mammal list is short and its bird list is not, which shapes what a visitor can expect. Red and roe deer, badger, fox, otter and red squirrel are the notable natives; the large predators were eliminated centuries ago, and the beaver has been reintroduced and is now established on several river systems. Scotland holds the animals most people travel for -- red deer at scale, pine marten, wildcat in tiny numbers, and golden and white-tailed eagles.

The seabirds are the world-class spectacle. The cliffs and islands of the north and west -- Shetland, Orkney, the Farnes, Skomer, Bass Rock -- hold internationally important colonies of gannets, guillemots, razorbills and puffins, and they are accessible in a way comparable colonies elsewhere are not: a day boat and a short walk. The season is narrow, roughly April to July, and outside it the cliffs are empty.

Inland, the reliable encounters are seasonal rather than geographic: deer rut in the autumn, murmurations of starlings over winter wetlands, and dawn birdsong in May, which in an oak wood on the western side of the country is as good as anything in Europe.