Dulas is a left-bank tributary of the Afon Irfon, itself a tributary of the

River Wye The River Wye (; cy, Afon Gwy ) is the fourth-longest river in the UK, stretching some from its source on Plynlimon in mid Wales to the Severn estuary. For much of its length the river forms part of the border between England and Wales ...

. It rises on the southeastern slopes of the

Elenydd Elenydd () is an upland area of Mid Wales, extending across parts of northern and eastern Ceredigion and Powys between Aberystwyth and Rhayader. Elenydd is also a name given to the medieval commote of Cwmwd Deuddwr which covered approximately ...

and runs southeast to join the Irfon at Garth. The river is bridged by both the B4358 and the A483 roads.Ordnance Survey 1:50,000 scale Landranger map sheet 147 ''Elan Valley & Builth Wells area''

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