Dulas is a left-bank tributary of the

Afon Irfon Afon Irfon (the River Irfon) is a river in Powys, Wales. It flows from the upper slopes of Bryn Garw in the Cambrian Mountains, through the Abergwesyn Valley, past the Nant Irfon National Nature Reserve in the hills above the village of Abergw ...

, itself a tributary of the

River Wye The River Wye (; ) is the Longest rivers of the United Kingdom, fourth-longest river in the UK, stretching some from its source on Plynlimon in mid Wales to the Severn Estuary. The lower reaches of the river forms part of Wales-England bor ...

. It rises on the southeastern slopes of the Elenydd and runs southeast to join the Irfon at Garth. The river is bridged by both the B4358 and the

A483 The A483, officially described as the Swansea to Manchester Trunk Road, although now ending in Chester, is a major road in the United Kingdom. It runs from Swansea in Wales to Chester in England via Llandovery, Llandrindod Wells, Oswestry and W ...

roads.Ordnance Survey 1:50,000 scale Landranger map sheet 147 ''Elan Valley & Builth Wells area''

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