Paimpont forest, sometimes said to be the Arthurian Brocéliande, is in the French commune of Paimpont, near the city of Rennes in Brittany. As Brocéliande it had a reputation in the Medieval imagination as a place of magic and mystery. It is the setting of a number of adventures in Arthurian legend, notably Chrétien de Troyes's Yvain, the Knight of the Lion, and locals claim the tree in which the Lady of the Lake supposedly imprisoned Merlin can still be seen today. Other recent legendary (from the 19th century) places said to lie within the forest include the Val sans Retour, the tomb of Merlin, the Fountain of Youth, and Hotié de Vivianne (castle of the Lady of the Lake). The medieval chronicler Wace visited the forest of Brocéliande (but is it really Paimpont) but left disappointed:


Paimpont is a forest of broadleaf trees, oaks and beeches mainly, with areas of conifers either inside after clear-felling or on the periphery as transition with the moor, for example towards the west in the sector of Tréhorenteuc and the Val-sans-Retour (= Valley of no Return) which was devastated by several fires in particular in 1976, a year of great drought. It occupies mainly the territory of the commune of Paimpont, but extends to bordering communes, mainly Guer and Beignon in the south, Saint-Péran in the northeast, and Concoret in north. The forest of Paimpont is the largest remnant of an ancient forest occupying Argoat, the interior region of Brittany. It was more often called the forest of Brécélien, but its ancient character and other qualities underlined by many authors decided on its name of "forest of Brocéliande", tallying of the adventures of the legend of the Round Table. This flattering designation was reinforced by the birth of the Pays de Brocéliande at the end of the 20th century, an institution intended to facilitate the development of the communes of the west of the département.