It is named after the River Morda, which, with the River Tanat, is one of the first major tributaries joining the River Severn as it wends its way from its birthplace on Plynlimon, mid-Wales, to the Bristol Channel.
The route has now been extended to start or finish in Coed Hafren having passed within viewing distance of the source of the river Wye on Plynlimon mountain near Aberystwyth, a total of 136miles.