A British man and his Romanian girlfriend were banned from Venice's historic city centre after swimming in the Grand Canal.
The couple, aged 35 and 25 respectively, each received a €450 (£388) fine and were ordered to leave the lagoon city for 48 hours.
Gondoliers reported the pair, who were reportedly celebrating the end of a romantic getaway, for violating local regulations against bathing in city waters.
Venice officials praised the reporting, stating the incident is part of a wider crackdown on "disrespectful and uncivil behaviour" and overtourism.
Locals expressed anger at the "senseless and dangerous" action, with the city having banned over 1,000 people from its centre this year for similar violations.