The A4109 road links Aberdulais with Glynneath in Neath Port Talbot county borough, Wales.
Map of A4109, Neath SA10, UK
The route begins in Aberdulais at the junction with the A4230 and A465 roads; it diverges northwards away from the A465 up the Dulais Valley and crosses through the settlements of Crynant, Ynysfforch, Seven Sisters, Onllwyn, Dyffryn Cellwen and Banwen where it has a junction with the A4221. The road then continues in a southeasterly direction along the Inter Valley Road to Glynneath where it again connects with the A465.
References
A4109 road Wikipedia(Text) CC BY-SA