The Blue Flag is sought for beaches, marinas, and sustainable boating tourism operators as an indication of their high environmental and quality standards.
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When the white flag is hoisted, the sea is calm and still supervised by the rescue service, so the conditions are perfect for bathers who can safely get into the water. The red flag, on the other hand, warns thatbathing can be risky and is therefore not recommended for bathers.
Finally, a purple flag means that there is dangerous marine life out on the water or beach. This could mean jellyfish, stingrays, sea snakes, or other marine life except sharks. If a shark is in the water, then a red flag or double red flag will be hoisted.