Created by monks in the 12th century, Lac au Duc is the largest of Brittany's inland lakes. Its 250 hectares extend between Ploërmel, Taupont and Loyat.
It is located in the middle of the Paimpont forest near the village of Folle Pensée. According to Arthurian legend, it is here that Merlin would have met the fairy Viviane.
It is in the magnificent forest of Brocéliande that the legend of King Arthur takes its source, between moors and ponds. Here is the wonderful world of the fairy Viviane, Merlin the enchanter and the knight Lancelot.