The Eryri A–Z is the master index to everything on this site — every major mountain, lake, village, castle, railway, waterfall, historic site and legend, organised alphabetically. Think of it as the front-of-book index for the whole of Snowdonia, linking into deeper guides on every subject. If you know the name of something in Eryri but aren't sure where to find out more, start here.
A
- Aber Falls (Rhaeadr Fawr) — 40-metre waterfall beneath the Carneddau, one of Wales's tallest
- Aberglaslyn Pass — dramatic river gorge near Beddgelert, one of the great valley landscapes of Eryri
- Adam and Eve — the twin summit rocks on Tryfan; tradition demands a jump between them
- Anglesey (Ynys Môn) — island visible from most Eryri summits; linked to the mainland by the Menai and Britannia bridges
- Aran Benllyn / Aran Fawddwy — the highest peaks of the Aran range in southern Eryri
B
- Bala (Y Bala) — lake town at the head of Llyn Tegid, centre of Welsh language culture
- Beddgelert — the most picturesque village in Eryri; home of the legend of Gelert
- Bethesda — slate quarrying town at the mouth of the Ogwen Valley; the Great Strike of 1900–03
- Betws-y-Coed — the outdoor capital of Wales; gateway to the Conwy Valley
- Blaenau Ffestiniog — slate capital of Wales; Zip World; Ffestiniog Railway terminus
- Bristly Ridge — Grade 2 scramble approach to Glyder Fach from Llyn Bochlwyd
C
- Cadair Idris — southern Eryri's great mountain; 893m; mountains and sea in one panorama
- Caernarfon Castle — Edward I's greatest fortress; UNESCO World Heritage Site; Prince of Wales connection
- Capel Curig — mountain crossroads village; base for Tryfan, Snowdon and the Glyderau
- Carneddau — vast mountain plateau in northern Eryri; Wales's second-highest mountain mass
- Castell y Bere — lonely Welsh princely castle in the southern Dysynni valley
- Conwy — medieval walled town; near-complete town walls; UNESCO WHS
- Crib Goch — Snowdon's legendary knife-edge ridge; Grade 3 scramble; serious mountain terrain
- Cwm Idwal — glacial corrie; National Nature Reserve; Darwin connection; rare Arctic-alpine plants
D–E
- Dinorwig Power Station — pumped-storage hydroelectric facility built inside Elidir Fawr; the largest in the UK
- Dolbadarn Castle — Welsh princes' castle above Llanberis; controls Llanberis Pass
- Dolgellau — market town at the foot of Cadair Idris; gateway to southern Eryri
- Eryri National Park — Snowdonia as defined since 2022; 823 square miles; established 1951
F–G
- Ffestiniog Railway — world's oldest narrow-gauge steam railway; Porthmadog to Blaenau Ffestiniog
- Glaslyn — copper-green lake beneath Snowdon's summit; extraordinary colour from copper ore in the rock
- Glyderau (Glyderau) — the chaotic plateau between Llanberis Pass and the Ogwen Valley; Glyder Fawr, Glyder Fach, Castell y Gwynt
H–L
- Harlech — clifftop town with UNESCO castle and Cardigan Bay views
- Harlech Castle — Edward I's dramatic clifftop fortress; inspired "Men of Harlech"
- Llanberis — Snowdon's base camp village; Snowdon Mountain Railway; Dinorwig
- Llyn Idwal — mountain lake at the heart of Cwm Idwal; National Nature Reserve
- Llyn Padarn — lake at Llanberis; watersports; Llanberis Lake Railway
- Llyn Tegid (Bala Lake) — largest natural lake in Wales; home of the gwyniad fish
M–R
- Moel Siabod — the isolated mountain above Capel Curig; perhaps the finest panoramic viewpoint in Eryri
- Ogwen Valley — mountain crossroads; Tryfan, Glyderau, Carneddau and Cwm Idwal all accessible
- Rhinogydd — ancient range in southern Eryri; rugged, remote, rarely crowded
S–Y
- Slate landscape — UNESCO World Heritage Site; Penrhyn, Dinorwig, Llechwedd quarries
- Snowdon Mountain Railway — Britain's only rack railway; 1896; Llanberis to summit
- Swallow Falls — most visited waterfall in Wales; Betws-y-Coed
- Tryfan — Britain's most famous scramble; North Ridge; Adam and Eve summit rocks
- Welsh language (Cymraeg) — Britain's oldest living language; dominant in much of Eryri
- Yr Wyddfa (Snowdon) — highest mountain in Wales and England; 1,085m; six main routes