As displayed by several myths and legends, water is a powerful means of destruction and reconfiguration of natural and human landscapes. This is especially evident when a flood is sent by god(s) or supernatural beings to punish sinful people and corrupt cities. Generally, this kind of catastrophe brings about the disappearance of a whole human community and the resulting transformation of a certain place. However, it may also happen that one or few persons, because of their piety or righteousness, are spared by the divine anger, sometimes along with their houses or something else. The present work starts from a discovery on the field of a local legend concerning Lake Varano, a coastal body of water in the Gargano peninsula (Apulia, Italy). According to this legend, Lake Varano would be the outcome of an ancient flood, sent by God to punish a prosperous and corrupt city, Uria, once flourishing in the place of the lake. Just like other more famous floods, this local flood is meant to mark a transition between an evil past, embodied by the sunken Uria, and a good present, embodied by a little church, formerly the house of the only survivor, Nunzia, a pious woman. As part of the broader corpus of flood narratives, this legend and the other ones here considered distinguish themselves as featuring a lake, which physically and symbolically shapes and connotes the religious, historical and geographical identity of a local community. Starting from Lake Varano’s origin legend, a structural and thematic analysis is conducted on a number of similar legends, in order to identify, classify and understand a particular category of narrative folklore, characterized by a significant interplay between water (flood- and lake-lore), history (ancient cities vanished), religious beliefs (retributive gods) and moral principles (evil and good). Eventually, such a comparative work will lead back to Lake Varano’s legend, because of the peculiarity of its heroine; unlike all the other survivors, who are passively rescued from a flood, Nunzia plays indeed an active part in the drama, thus resulting a co-author, with the flood, of a local place-making, that is the main concern of these legends.