The oldest heritage has been preserved in the Fontanigge basin of the Sečovlje Salina, where ruins of the old salt-pan houses, traces of salt-fields, levees and channels speak of the fact that the Old Piran Salt-pans had been active until the 1960s. The Old Piran Salt-pans cultural heritage has been preserved, protected and demonstrated by the Museum of Salt-making situated on the bank of the Giassi Channel.

Of the once numerous salt-pans in the Gulf of Trieste, only those at Sečovlje and Strunjan have been preserved. Their testimonial value is therefore even greater, for it places them at the level of ethnological, technical, historical, settlement and landscape heritage of exceptional significance.

The salt-pans immovable cultural heritage includes the still functioning as well as abandoned salt-fields, channels and levees with stone walls, steps and sluice gates (with only their stone parts preserved), salt-pan houses with their immediate vicinity (including their ruins and localities), paths, bridges, wind pumps, etc.
The Strunjan and Sečovlje salt-pans are the only ones along the eastern Adriatic coast, where salt is produced, with traditional procedures in the entire process, by daily gathering in brine on the biosediment – the petola.