Saint-Jean-Vianney (French pronunciation: [sɛ̃ ʒɑ̃ vjanɛ]) was a village in the Saguenay-Lac-Saint-Jean region of Quebec, which was abandoned after it was partially destroyed in a landslide on May 4, 1971.
Located near the shore of the Saguenay River, Saint-Jean-Vianney was — unbeknownst to residents at the time — built atop a bed of unstable Leda clay, a type of subsoil which can liquefy under stress.
Over the few weeks leading up to the landslide, cracks were reported in some of the town's streets and driveways, some house foundations dropped roughly six to eight inches (15 to 20 cm) into the soil, and some unusual noises — including underground thumps and an untraceable sound of running water — were reported.
Subsequent research into the slide revealed that Saint-Jean-Vianney was in fact built directly atop the site of another landslide approximately 500 years earlier, long before any settlement had ever taken place in the area.
The site of Saint-Jean-Vianney remains uninhabited today, although a small park near Shipshaw and a museum exhibit at Saguenay's Place du Presbytère commemorate the event.