Eraclea Mare is, together with Jesolo and Caorle, one of the main seaside resorts on the Venetian coast facing the Adriatic Sea.

The city has been awarded the "Blue Flag" from the Foundation for Environmental Education every year from 2007-2017 for the cleanliness of its beaches and seawater.

The Lagoon, an unusual natural formation, was caused by the overflowing of the Piave river in 1935, whose bed was modified in its last stretch after a large flood.

The Lagoon stretches between the Eraclea's Lido and the mouth of the Piave river and it is a sea-lagoon, being supplied with water only by the flood-tides.

Still uncontaminated, the Mort is characterized by shallow and calm waters with a sandy and muddy seabed, rich in phytoplankton.