Sarn Helen in Onllwyn

Sarn Helen in Neath Port Talbot, Onllwyn ist ein historisches Objekt. It runs in a north-south direction starting from BY 31/39.N.Hi/2 and crosses BY 31/39.N.Hi/3, BY 31/21.N.Hi/1 and Sarn Helen (BY 31/39.N.Hi/2) and ends at BY 31/39.N.Hi/2. It connects Glynneath and Onllwyn. Sarn Helen is near BY 31/21.N.Hi/1.