氷河 ひょうが 決壊 けっかい洪水 こうずいでした
hyōga kokekkaikōzuideshita

Noun
Desu Copula

The polite past form of 氷河湖決壊洪水

1. Glacial lake outburst flood was. ; ; Glacial lake outburst flood occurred.

Past/Perfective
Polite