Lago San Giovanni, reservoir near Naro, Sicily, Italy

Lago San Giovanni is an artificial reservoir on the Naro River in the territory of Naro, Agrigento province, formed by a dam built between 1969 and 1981 at the Stretta del Molino San Giovanni, about 20 km from the river mouth. It is linked to the Furore dam, which blocks the Grancifone torrent, a tributary of the Naro. Its water is used mainly to irrigate the surrounding farmland, and a pine wood lines part of the shore.

The reservoir was built between the 1960s and 1980s to collect water from the Naro River for irrigation and water management. In 1991, European rowing championships took place here, bringing the site into focus as a competitive sports venue.

The reservoir's name comes from the Stretta del Molino San Giovanni, the narrow spot on the Naro where the dam stands. Its water irrigates the surrounding farmland, and the pine wood along the shore draws visitors, especially on holidays. Sport fishing is popular: black bass, mirror carp, queen carp and crucian carp are caught, with a few golden crucians and koi.

The reservoir lies in the Stretta del Molino San Giovanni locality, about 20 km from the Naro River mouth, in Naro territory. The banks are easy to reach from the pinewood area, and submerged shrubs are scarce, which helps anglers. The surrounding wood draws visitors mainly on holidays.

The reservoir hosted the 1991 European rowing championships, revealing its importance as a competitive sports venue beyond its irrigation role. Few visitors notice that the water level changes noticeably with seasons, affecting how the shoreline appears throughout the year.