This post was first published on #FolkloreThursday.com on July 20th titled Welsh Lake Legends and Folklore: Llyn Barfog, the Female Dwellers of Annwn and King Arthur and the Afanc by zteve t evans

Lyn Barfog by andy [CC BY-SA 2.0 (https://creativecommons.org/licenses/by-sa/2.0)%5D, via Wikimedia Commons
Doorways to Annwn
In Welsh mythology and tradition, many of the Welsh lakes are regarded as doorways to and from Annwn, or the Otherworld. Many people believed the lakes to be connected to one another by underground rivers or subterranean ways that made them one vast underworld. There are examples of inhabitants of the Otherworld appearing from some of these lakes, such as the faerie brides of Llyn y Fan Fach and Llyn Coch, to spend time on Earth and then return to their own world. Llyn Barfog appears to be one of many such lakes in Welsh folklore, where the dwellers of Annwn have entry and exit to the earthly world.
The Gwragedd Annwn
This legend tells how Llyn Barfog is associated with mythical beings called the Gwragedd Annwn, also known as the Elphin Dames, who were female dwellers of Annwn. At times, these could be seen in the distance on the hills and mountain tops. They were often accompanied by pure white dogs, known as the Cwn Annwn, and were either driving or tending a herd of milk-white cattle known as the Gwartheg Y Llyn. Both the dogs and the cattle were said to have had reddish-coloured ears and white coats.
The local people all knew about them. They had often seen them from afar for fleeting moments before they would vanish, and few had ever seen them up close. They realised they were the Gwragedd Annwn, who lived under the hills and lakes of Wales, and steered clear of them. The males were the Plant Annwn, and were often associated with Gwynn ap Nudd who was their lord.