Cala Montjoi and Posidonia

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The presence of balls of posidonia oceánica or Neptune grass is remarkable in the Cala Montjoi, you’ve probably seen them many times before and would have thought they were just dirt from the sea. Neptune grass is not an algae, but a plant that grows on the seafloor forming grasslands and gives refuge and nourishment to numerous fish.

This plant is forever in the waves and its leaves release fibres that, when dragged, join together to form hairy balls that reach the coast and appear on our towels. Neptune grass balls are an indicator that sea water is in good condition since the plant is very sensitive to marine pollution and does not grow if the water is not of good quality. Posidonia is named after the Greek god of the sea, Poseidon.