Dewis areas Dewis Cymru currently has local information for North Wales, Cardiff, the Vale of Glamorgan, Rhondda Cynon Taf and Merthyr Tydfil. Local information for other areas will be added soon. What is Dewis? Dewis Cymru is the place for information about well-being in Wales. We have information that can help you think about what matters to you, along with information about local organisations and services that can help! Dewis – one year on… A year since the 1st service was added to Dewis Cymru we have over 3,000 services & over 35,000 ‘hits’ per month. What a year!