Visitors to Betws Mountain had a kick in the eye this week after fly tippers were found to have deposited litter across the popular beauty spot.
Sections of the grassland had been covered with litter including plastic bottles, tin cans and McDonald's wrappers.
“The car park above the Scots pine is disgusting,” said concerned resident Hywel Davies.
“Why do people think they can do this in such a beautiful part of Carmarthenshire? People need to start behaving like responsible adults.”
Locals are also concerned at the motorists who are using the narrow road leading up to the mountain as a race track.
“It’s totally dangerous and irresponsible to drive like that on such narrow roads. These drivers are acting as if they’re in Brands Hatch."
Abandoned litter such as that currently lying on Betws can create dangerous conditions for wildlife; hazardous chemicals can leak out of the litter and pollute the soil and nearby water.
These toxins can ultimately enter into the food chain. The contaminants can also inhibit plant growth and can cause health issues in animals.
They are in danger of getting trapped and entangled in plastic packaging, they can cut themselves on sharp objects and they can suffocate if their heads become trapped inside the plastic bags.
Betws Mountain is situated between Ammanford and Clydach and comprises a large area of tussocky grassland.
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The remains of the medieval castle Penlle’r Castell lie close to the summit while a 15-turbine wind farm located on the site is capable of generating enough electricity to power 23,800 households which equate to one third of the domestic usage in Carmarthenshire.
Meanwhile local residents and walkers are being urged to keep a look out for fly tippers and report any further incidents to Carmarthenshire County Council.
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