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jonncrisp
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A60A5876
A60A5876

Taken from Gwaith Powdwr North Wales WLT overlooking the
Dwyryd Estuary.

At Maentwrog the Dwyryd becomes a long and sandy tidal estuary, flowing under the road and railway line at Pont Briwet, before joining with the estuary of the River Glaslyn and then entering into Porthmadog Bay. The Afon y Glyn which drains the southwest catchment from Llyn Tecwyn Uchaf and Llyn Tecwyn Isaf enters the southern side of the Glaslyn estuary at the south end of a large extent of salt marsh known as Glastraeth (green beach) on its south bank and opposite the village of Portmeirion.
The whole of the river drains off igneous and ancient rocks of the Cambrian and Ordovician which are all base-poor. Much of the catchment has also been used for commercial forestry during the last hundred years. As a consequence, many of the tributaries are highly acidic as a result of atmospheric acidification. This has constrained the quality of the fishery and the biodiversity in many tributaries. Some of these problems have been exacerbated by past industrial activities including metal mining, slate mining, animal skin processing and the use by the army of a gunnery range with large amounts of emplaced metal cartridge shells.

.Gwaith Powdwr, situated in Penrhyndeudraeth, Wales, is a decommissioned explosives works now managed as a Nature Reserve by the North Wales Wildlife Trust. The explosives factory was initially opened in 1865 and changed hands several times before being bought by Ralph Cooke in 1922.

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Taken on: April 17, 2021
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Camera: Canon EOS 5D Mark IV, f/11.0, 1/100 sec, 24mm, ISO 200 (more info) (hide info)
Camera: Canon EOS 5D Mark IV
Lens: 24.0 - 105.0 mm
Aperture: f/11.0
Exposure Time: 0.01 sec (1/100)
Focal Length: 24mm
ISO: 200
Exposure Bias: 0 EV
Flash: Off, Did not fire
Exposure Program: Manual
Exposure Mode: Manual
Metering Mode: Spot
White Balance: Manual
Sharpness: Hard
Color Space: sRGB
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