PWLLHELI, Porthmadog and communities along Afon Glaslyn in Gwynedd and Afon Cefni in Anglesey could be underwater by 2030 according to new data. 

Rising sea levels threaten Porthmadog, Tremadog, Minffordd, Prenteg, Garreg and Nantmore according to Climate Central. An independent organisation of scientists and journalists, it has pulled together data projections and peer-reviewed science from leading journals to create a map showing which areas of the UK could be under sea level in just six years and beyond.

Pwllheli and Penrhos are also facing potentially devastating sea level rises while the Dinas Dinlle peninsula may be completely lost.  

On Anglesey the area from Malltraeth to Lledwigan is under threat while further south Ceunant Llennyrch National Nature Reserve in Blaenau Ffestiniog, Glan-y-Wern, Pen-Sarn and the area around Shell Island, Barmouth, Fairbourne, Tywyn and Ynyslas may all be inundated.

The data reveals much of coastal north Wales is at risk of being under water with communities and wildlife habitats potentially devastated.

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Climate Central maps are not based on physical storm and flood simulations and do not take into account factors such as erosion, future changes in the frequency or intensity of storms, inland flooding or contributions from rainfall or rivers.

A spokesman for Climate Central said: “As these maps incorporate big datasets, which always include some error, these maps should be regarded as screening tools to identify places that may require deeper investigation of risk.

“Our approach makes it easy to map any scenario quickly and reflects threats from permanent future sea level rises as well.”