About its formation there are several legends sprung from the people. Orbán Balázs, who during his travellings wrote legends about Szeklerland, doesn't mention myths about the Red Lake. Urmánczy Nándor wrote for the first time in his itineraries about the legend, in which he memoralises a story told by an old sekler man. According to the legend a robber, who stayed in the cave of Suhardul Mare, had stolen from a fair in Ditrău and dragged along the beautiful Ferenc Anikó. The girl cried and implored the help of the cave ghost, when the walls of the cave opened and she escaped. When the robber came around, he banged the cliff with his bludgeon so strongly that the mountain collapsed and closed the valley burying under itself the robber. In the course of the years several variants of the legend appeared. The popular belief connects the "killing" and the "red " adjectives with the legend, whereas the collapsing mountain buried under itself the grazing herd together with its shepherd, the blood oozed up and painted the lake water red for a long time.