The rock arch featured in films and the popular Game of Thrones television series, and was also notorious for tourists' cliff-jumping into the clear blue waters below.
Maltese Prime Minister Joseph Muscat tweeted of the "heartbreaking" loss of one of Gozo's main tourist attractions.
Mr Muscat said in a tweet that the famous Mediterranean landmark had always faced destruction because of natural corrosion.
"That sad day has arrived," he wrote.
