Franco Battiato sings about love philosophically. It's useless to have regrets, since we can't go back in time.

Permeating the song are images of a Sicilian beach in the hot summer and the waves that could carry you out to sea.

Tozeur is a city in southwestern Tunisia, near the Algerian border. The train line referred to in the song was originally built for the king in the early 1900s when Tunisia was still a French protectorate. More info about the song here.