How is Gwynedd described in the novel, The Lost Years Of Merlin?

Gwynedd is described as a land of forests and small villages, where ancient sacred sites and beliefs still exist in harmony with newer Christian elements. There is a city, Caer Myrddin, with a church and convent where young Emrys and his foster mother seek shelter after Emrys' emerging powers create a firestorm which blinds him and kills another boy. The time period is shortly after Roman forces left Britain. The technology and commercial ties they brought are still largely intact, with roads fanning out from Caer Myrddin to distant places, and barge traffic along the rivers.