Beach flags serve as an essential guide for ocean safety, each color conveying a specific message. These flags help swimmers, surfers, and beachgoers make informed decisions about entering the water. A green flag signifies safe and calm conditions, while a yellow flag warns of moderate hazards such as rough waves or currents. The red flag, perhaps the most recognizable, signals dangerous conditions, often advising against swimming due to strong currents or hazardous surf. However, not all flags indicate water conditions alone—some provide warnings about marine life as well.

Among the lesser-known flags, the purple flag carries a unique and crucial warning. When this flag is raised, it signals the presence of marine pests, which could include jellyfish, stingrays, or other potentially harmful sea creatures. Unlike the red or yellow flags that caution against natural water hazards, the purple flag focuses on threats lurking beneath the surface. This warning allows beach visitors to take necessary precautions, such as avoiding the water or wearing protective gear like water shoes. It serves as a reminder that ocean safety isn’t just about waves and currents but also about the creatures that share the water.