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Photo: Tsaag Valren, CC BY-SA 4.0 via Wikimedia Commons
The Valley is where legend says that the fairy Morgane (half-sister of King Arthur) locked up unfaithful men. Only Lancelot du Lac managed to escape. He made free all the knights who were prisoners.
The Val sans retour, also known as the Val des faux amants or the Val périlleux, is a mythical site from Arthurian legend, as well as a physical site located in central Brittany, in the Paimpont forest. The legend attached to it is primarily recounted in the Lancelot-Grail: in it, Morgan le Fay experiences a disappointment in love with the knight Guiomar, and, in retaliation, creates the Val sans retour in the forest of Brocéliande, where any knights unfaithful in love are imprisoned.