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The River Arth is a small
river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of w ...
that rises in the hills near Bethania,
Ceredigion Ceredigion ( , , ) is a county in the west of Wales, corresponding to the historic county of Cardiganshire. During the second half of the first millennium Ceredigion was a minor kingdom. It has been administered as a county since 1282. Cer ...
,
Wales Wales ( cy, Cymru ) is a country that is part of the United Kingdom. It is bordered by England to the east, the Irish Sea to the north and west, the Celtic Sea to the south west and the Bristol Channel to the south. It had a population in ...
, and runs west for and discharges into
Cardigan Bay Cardigan Bay ( cy, Bae Ceredigion) is a large inlet of the Irish Sea, indenting the west coast of Wales between Bardsey Island, Gwynedd in the north, and Strumble Head, Pembrokeshire at its southern end. It is the largest bay in Wales. Geo ...
at
Aberarth Aberarth is a village in Ceredigion, Wales, in the community of Dyffryn Arth, on the southern end of Cardigan Bay between Aberystwyth and Cardigan at the mouth of the River Arth on the A487 road. The Wales Coast Path passes through the village. ...
. Despite its small size it is one of the few rivers in Britain which has a bore when the incoming tide cause a tidal wave to run upstream. The bore is only a few inches high and it runs only for a short distance upstream; beyond the road bridge in Aberarth the terrain rises steeply, preventing the bore propagating any further. In the 1970s, the River Arth suffered severe intermittent
agricultural pollution Agricultural pollution refers to biotic material, biotic and abiotic byproducts of agriculture, farming practices that result in pollution, contamination or degradation of the environment and surrounding ecosystems, and/or cause injury to human ...
from a dairy unit not far from the village but improved pollution control and a change of ownership of the farm rectified that position.


External links


Photo of the River Arth on geograph.org.uk
Arth Arth is a village, a town, and a municipality in Schwyz District in the canton of Schwyz in Switzerland. The municipality consists of the villages Arth, Oberarth, and Goldau. The four settlements Rigi Kulm, Rigi First, Rigi Klösterli, an ...
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