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Afon Dulyn (English : River Dulyn) is the outflow from Llyn Dulyn, a lake in the Carneddau mountains in north-west Wales. It is a tributary of the river Conwy.

Just below Afon Dulyn the river is joined by Afon Melynllyn, a small river flowing from neighbouring Llyn Melynllyn.

The river does not carry a great deal of water because water is transferred from Llyn Dulyn to the reservoirs of Llyn Eigiau and Llyn Cowlyd.

Ceunant Dulyn

Ceunant Dulyn, or the Dulyn Gorge, has been designated a Site of Special Scientific Interest (SSSI) since 1 January 1961 as a conservation measure to protect the site on account of its wildlife.^[1] Its area is 35.66 hectares. Natural Resources Wales is the body responsible for the site.

References

v t e Conwy Valley
Towns	Llanrwst Conwy
Other settlements	Betws-y-Coed Caerhun Dolgarrog Eglwysbach Glan Conwy Henryd Llanbedr-y-Cennin Llanddoged Llangelynnin Llanrhychwyn Maenan Rowen Tal-y-bont Tal-y-Cafn Trefriw Tyn-y-groes
Rivers & streams	Afon Conwy Afon Crafnant Afon Geirionydd Afon Hiraethlyn Afon Machno Afon Lledr Afon Llugwy Afon Gallt y Gwg Nant y Goron Afon Ddu (1) Afon Porth-llwyd Afon Dulyn Afon Ddu (2) Afon Garreg-wen Ffrwd Cerriguniawn Afon Melynllyn Afon Roe Afon Tafolog Afon Gyffin
Lakes	Llyn Crafnant Llyn Elsi Llyn Geirionydd Llyn Parc
Waterfalls	Conwy Falls Grey Mare's Tail Fairy Falls
Hills & mountains	Mynydd y Dref Tal y Fan Bwlch-y-Ddeufaen Cefn Cyfarwydd Mynydd Hiraethog
Castles & forts	Canovium Conwy Castle Gwydir Castle Pen y Gaer
Bridges	Conwy Railway Bridge Conwy Suspension Bridge Pont Fawr (Llanrwst) Tal-y-Cafn Bridge Waterloo Bridge (Betws-y-coed)
Other features	Bodnant Garden Cadair Ifan Goch Conwy RSPB reserve Gwydir Forest Klondyke mill Maenan Abbey Moel Maelogan Snowdonia National Park Surf Snowdonia Trefriw Woollen Mills Tu Hwnt i'r Bont Tŷ Mawr Wybrnant
Transport	A470 A5 B5106 Conwy Valley line Conwy Valley Railway Museum Sarn Helen
Railway stations	Betws-y-Coed railway station Dolgarrog railway station Glan Conwy railway station Llanrwst railway station North Llanrwst railway station Tal-y-Cafn railway station
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