[needs update] Castellavazzo is a comune (municipality) in the Province of Belluno in the Italian region of Veneto, located about 90 kilometres (56 mi) north of Venice and about 20 kilometres (12 mi) northeast of Belluno.

[2] On 9 October 1963 at 10:35 pm, heavy rainfall and the 3rd drawing of the Vajont Dam triggered a landslide.

It was 270 million cubic metres (9.5×109 cu ft) of rock, forest and earth that slid into the Vajont Dam at 110 kilometres per hour (68 mph).

This then caused a 250-metre (820 ft) high tsunami that overtopped the dam and flooded Castellavazzo and other villages such as Longarone, Pirago, Rivalta, Villanova, Faè, Erto e Casso and Codissago.

About 2,000 people were killed in the landslide and tsunami, but the main structure of the dam is still there, and many tourists come to see it.