Eryri

Eryri was the first of Wales's national parks — designated in 1951, when it was still officially Snowdonia — and it holds nearly everything in the country that stands high: all fifteen summits above the 3,000-foot line crowd into its three northern ranges, with Yr Wyddfa itself, at 1,085 metres, the highest ground in Britain south of the Scottish Highlands. The rock is the wreck of an Ordovician volcanic arc, and it keeps one of geology's better jokes: the summit sits in a downfold, not an upfold, and the strata at the top carry fossil shells from the sea floor they once were. Ice did the sculpting — Crib Goch's knife-edge, the black cirque lakes, and Cwm Idwal, where Charles Darwin walked in 1831 without seeing the evidence and came back in 1842, after reading Agassiz, to find moraines and glacier-polished rock "as plain as a house burnt down by fire"; the cwm later became Wales's first national nature reserve. South of the big ranges the park runs quieter and emptier — the boulder-and-heather wilderness of the Rhinogydd, Cadair Idris with its legend that a night on the summit returns you a poet or a madman, and the Aran ridge dropping to Llyn Tegid at Bala, the largest natural lake in Wales, where the gwyniad, a whitefish stranded here at the end of the last glaciation, swims and nowhere else on earth.

The human landscape is slate. The 1951 boundary was drawn with a hole in it — Blaenau Ffestiniog and its quarries were left out so the park would not contain a working industry, and the town still sits in its grey amphitheatre encircled by park on every side — while the wider slate country that roofed the nineteenth-century world became a UNESCO World Heritage Site in 2021. The industry's afterlives are strange and grand: Dinorwig's turbine halls were hollowed into the mountain of Elidir Fawr to make Europe's largest pumped-storage station, the Ffestiniog Railway, built in 1836 to run slate down to Porthmadog by gravity, is the oldest narrow-gauge railway company on earth, and Britain's only rack-and-pinion railway has ratcheted visitors up Yr Wyddfa since 1896. This is also the heartland of the Welsh language, spoken by roughly six in ten residents, and the place-lore runs deep: Dinas Emrys above Beddgelert is where the red dragon fought the white in the story that ends on the national flag, while Gelert's grave in the village below is a hotelier's invention of about 1800 that out-draws most genuine monuments in Wales. The park's own renaming — Eryri and Yr Wyddfa, put first by the authority in 2022 — retired "Snowdonia" from official use; the old gloss "abode of eagles" is probably folk etymology for a word that meant simply the high country.

For all the crowds, the biology is arctic. The Snowdon lily — its old genus name Lloydia honours the Welsh naturalist Edward Lhuyd — survives on a handful of north-facing ledges here and nowhere else in Britain; feral goats patrol the Rhinogydd; semi-wild ponies winter out on the Carneddau plateau; and the whole massif became an International Dark Sky Reserve in 2015. The pressure is real — around six hundred thousand people climb Yr Wyddfa in a year, and the honeypot paths braid and erode — but it is easy to shed: on the Migneint's blanket bog, along the Arans, or in the Rhinogydd, where the misnamed Roman Steps — medieval packhorse paving — climb through Bwlch Tyddiad, you can walk all day alone.

What's worth knowing before you go

Betws-y-Coed on the Conwy Valley line and Porthmadog on the Cambrian Coast line are the rail gateways, stitched together across the park by the heritage Ffestiniog and Welsh Highland trains and the Sherpa'r Wyddfa buses — which are also the sane answer to Yr Wyddfa itself, since Pen y Pass parking must be booked ahead. Of the six paths up, Llanberis is the long easy trudge, the Watkin — opened in 1892 with a speech from Gladstone, then 82 — has the hardest finish, and Crib Goch is a genuine scramble with fatalities most years, not a walk. Expect water: Crib Goch's rain gauge averages about 4,500 mm a year, the wettest reading in Britain, and summit weather bears no relation to sunshine in Llanberis. The connoisseur's day skips the mountain entirely — the Minffordd path up Cadair Idris over the glacial bowl of Llyn Cau, or the Rhinogydd traverse, coming down to the Mawddach estuary to cross Barmouth's long wooden railway viaduct on foot.