Heavy rainfall caused also landslides in Pisticci.[58] On 9 October 1963, the Vajont Dam, near Longarone, Veneto, experienced a landslide into an artificial lake, triggering a seiche wave and a megatsunami; 1,917 people were killed and many towns in the Piave river valley were obliterated. On 4 November 1966, the 1966 Flood of the Arno River in Florence, Tuscany, killed 34 people and damaged or destroyed millions of masterpieces of art and rare books in Florence. On 18 July 1985, near Tesero, Trentino-Alto Adige/Südtirol, the Val di Stava dam collapsed; an artificial reservoir breached the dam, killing 286 people.