You cannot swim in the canals of Venice's historic center—doing so is strictly illegal and can result in fines of €350 or more, plus a temporary ban from the city (DASPO). However, you can swim in the sea within the Venetian Lagoon if you go to the correct locations. The most popular spot is the Lido di Venezia, a long barrier island with vast sandy beaches that face the Adriatic Sea. In 2026, many locals and tourists take the vaporetto (water bus) to the Lido for a beach day at Alberoni or the Blue Moon beach. Other legal swimming spots include the beaches at Pellestrina, Punta Sabbioni, and the "Spiaggia del Bacan" on the island of Sant'Erasmo. These areas offer clean, monitored sea water, which is a stark contrast to the murky, boat-trafficked lagoon water near the Rialto Bridge. While the canals might look tempting on a hot day, they are hazardous due to tidal currents, heavy boat traffic, and sanitary issues, so always head to the outer islands if you want to take a dip in the Adriatic.