7Vouliagmeni Beach, Attica

Close to Athens, Vouliagmeni is hugely popular with locals and tourists. However, its popularity is also its danger. Overcrowding in peak season leads to accidents from jet skis, speedboats, and careless swimmers.

Furthermore, this beach is known for sudden jellyfish appearances in late summer, which can cause painful stings. While not the most life-threatening of dangers, it’s an unpleasant risk that visitors should be aware of.

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