The following is a list of notable mountain passes in Wales:
Pass nameTranslation/alt. nameRoad numberOS grid ref of summitHistoric countyPrincipal areaNational Park?Maximum Elevation(m) NotesAberglaslyn PassA498CaernarfonshireGwyneddSnowdoniaBwlch Bryn-rhuddEnglish: pass of the crimson hillA4067 between Defynnog and AbercrafBrecknockshirePowysBrecon BeaconsBwlch Cerrig DuonEnglish: pass of the black stonesminor road between Trecastle and Swansea ValleyBrecknockshirePowysBrecon Beacons369mBwlch y Cloddiaua.k.a. 'the Mohican Road'right of way between Llangurig and CwmystwythMontgomeryshirePowys533mRight of way. Eastern approach paved road; western approach largely unpaved.Bwlch y FedwenA458 between Mallwyd and LlangadfanMontgomeryshirePowysBwlch Esgair Gelliroad between Abergwesyn and TregaronCardiganshireCeredigion472mBwlch ar y Fana.k.a. the Gap Roadrestricted byway between Pontsticill and BreconBrecknockshirePowysBrecon Beacons599mRocky track over the pass.Bwlchgylfin B4418 between Rhyd Ddu and Dyffryn NantlleCaernarfonshireGwyneddSnowdonia236mBwlch Llyn BachEnglish: pass of the small lakeA487 between Dolgellau and CorrisMerionethshireGwyneddSnowdonia285mBwlch Oerddrws A470 between Dolgellau and Dinas MawddwyMerionethshireGwyneddSnowdonia363mBwlch y Parc A494 between Mold and Vale of ClwydDenbighshire Denbighshire291mthrough the Clwydian RangeBwlch Penbarrasa.k.a. 'Old Bwlch'minor road between Tafarn-y-Gelyn and Llanbedr-Dyffryn-ClwydDenbighshire Denbighshire362mthrough the Clwydian RangeBwlch Pen-y-feidioga.k.a. 'The Gated Road'minor road between Llanuwchllyn and BronaberMerionethshireGwyneddSnowdonia531mBwlch-y-Ddeufaen English translation: pass of the two stonesminor road/track between Abergwyngregyn and Vale of ConwyCaernarfonshireGwyneddSnowdonia429mCrimea Pass Welsh: Bwlch y GorddinanA470Caernarfonshire & MerionethshireGwyneddSnowdonia385mBwlch y GroesEnglish translation: pass of the cross Commonly known as Hellfire Passminor road between Llanuwchllyn and Dinas MawddwyMerionethshireGwyneddSnowdonia545mHighest paved pass in North Wales.Gospel Pass Welsh: Bwlch yr Efengyl minor road from Hay-on-Wye to Vale of EwyasBrecknockshire PowysBrecon Beacons549m Highest paved pass in Wales.Horseshoe Pass Welsh: Bwlch yr Oernant (pass of the cold stream) A542DenbighshireDenbighshire417mMilltir GerrigEnglish translation: mile of stonesB4391 between Llangynog and BalaMerionethshireGwynedd Snowdonia486mNant Ffrancon PassA5 between Bethesda, Gwynedd, and Llyn Ogwen in ConwyCaernarfonshireGwyneddSnowdonia312mPengenfforddA470 between Talgarth and Vale of UskBrecknockshirePowysBrecon BeaconsPen-y-PassEnglish: Llanberis PassA4086Caernarfonshire GwyneddSnowdonia359mThe mountains of England and Wales, Volume 1 Wales John and Ann NuttalPen Rhiw-wenA4069 between Llangadog and BrynamanCarmarthenshireCarmarthenshireBrecon BeaconsRhiw FawrEnglish: Forge Roadminor road between Machynlleth and StaylittleMontgomeryshirePowys509mPen Bwlch LlandrilloDrovers road between Llanarmon Dyffryn-Ceiriog and Llandrillo/CynwydMerionethshireDenbighshire580mUnpaved drovers road over the pass.Storey Arms A470 between Brecon and Merthyr TydfilBrecknockshirePowysBrecon Beacons435mSychnant Pass Welsh: Bwlch Sychnant (dry stream pass)minor road between Dwygyfylchi and ConwyCaernarfonshireConwy158mTorpantau minor road from Talybont-on-Usk to Pontsticill BrecknockshirePowysBrecon BeaconsBwlch Bryn-rhudd A4067Brecknockshire PowysBrecon Beacons
References Where not otherwise specified, much information is taken from 1:25,000 and 1:50,000 scale maps published by the Ordnance Survey.