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As the canal has no locks, sea water flows freely into the lake from the Mediterranean and the Red Sea, replacing water lost to evaporation. The lake acts as a buffer for the canal, reducing the effect of tidal currents.
During the Six-Day War in 1967, the canal was closed, leaving 14 ships trapped in the lake until 1975. These ships become known as the " Yellow Fleet ", because of the desert sands which soon covered their decks. A number of local postage stamps (or rather, decorative labels, since they had no postal validity) were created by the crews, which are sought after by collectors.