During the month of May, we always have a period of some kind of "snow" on the beach. During a short time frame, large amounts of a gelatinous mass are carried by the waves and the wind to the shore. This mass is in fact what remains of large colonies of dead algae (Phaeocystis), embedded in a gelatinous matrix. It is impressive to see, but also a pain in the xxx (it stinks, and it sticks to shoes and a dog's coat). Don't know if this is something international or only regional.