Flags of the Sea – what we need to know
Understanding marine signalling is the most important safety rule, ensuring our beach holiday passes without incident. Before entering the water, we should always look for the lifeguard station first, as the colour of the raised flag gives us immediate and vital information about the current state of the sea and risk levels. A standard and easily recognisable three-colour system is used along the Bulgarian Black Sea coast, which every tourist is obliged to adhere to.
- A green flag means the sea is completely calm, swimming is permitted for everyone, and there are no hidden dangers or strong currents.
- The yellow flag signals increased caution – swimming is permitted, but children and non-swimmers are forbidden from entering the water without a supervisor, as is the use of inflatable items.
- A red flag means it is absolutely forbidden to enter the water – the sea is extremely dangerous due to strong waves, undertow, or rip currents, and swimming is strictly prohibited.
Green flag at sea – what to keep in mind
The green flag is the most desired sight for any beachgoer. Its presence signals that the sea is calm, swimming conditions are excellent, and there are no visible dangers. The choice of green is not accidental – in international standards for safety and visual communication, green is a universal symbol for safety, a clear path, and the absence of immediate threat, making it easily recognisable to tourists from all over the world.
The raising of the green flag is not a subjective decision, but is based on strict criteria defined by the Water Rescue Activity Ordinance. Early in the morning, before the official opening of the beach's working hours, the senior lifeguard on duty or the senior lifeguard for the entire beach inspects the sea and the shoreline.
A green flag is flown only when the sea's swell is below 1-2 Beaufort, there are no strong underwater currents, there is no surf, and there are no dangerous marine creatures or pollution.
However, the situation at sea is dynamic and rescuers monitor conditions continuously. The green flag may be changed immediately in the following situations:
- Sudden gust of wind and rising sea swell.
- The appearance of a strong rip current or dead swell, which often happens in the afternoon or when the wind direction changes.
- Registration of scour holes or sharp changes in the seabed's relief after a storm.
- Indications of water pollution or the appearance of dangerous passages of jellyfish.
It is extremely important to understand that a green flag does not negate the adherence to general safety rules. The sea always hides risks, and a calm surface can be deceptive.
What are the basic safety rules you should follow even when there is a green flag?
- Swim only in the designated area and do not go beyond the yellow buoys that mark the safe boundary of the beach, as the jet ski and boat zone begins beyond them.
- Always obey the verbal instructions and whistle signals of the lifeguards on duty.
- Never leave children under 12 years old in the water without direct adult supervision, no matter how calm the sea is.
- Do not enter the water after a heavy meal or alcohol – wait at least 1-2 hours after eating before swimming to avoid cramps or more serious physiological discomfort.
- Do not use inflatable items if you are swimming in the sea – inflatable mattresses and rings can easily be carried away by a light wind or surface current far from the shore.
Yellow flag on the beach
The yellow flag is an official signal for increased caution and indicates that sea conditions are starting to deteriorate. The choice of yellow is linked to international warning standards, where it traditionally signifies moderate danger, requiring vigilance and readiness to respond. The decision to hoist it is made by the lifeguard team when the wind intensifies and the waves rise to approximately 2-3 Beaufort.
The yellow flag is also displayed in the presence of moderate underwater currents, the appearance of single holes in the seabed, or if there is a forecast of rapidly changing weather conditions. Lifeguards monitor the sea continuously and switch to this signalling to limit the risks for less experienced swimmers, without imposing a complete ban on entering the water.
When a yellow flag is raised, you must adhere to the following mandatory rules:
- Children under 12 years of age and people who cannot swim are not allowed to enter the water without a chaperone.
- The use of inflatable mattresses, belts, boats and toys is strictly prohibited as the wind and currents can quickly carry them out to sea.
- Entry into the water is permitted, but swimming further out is restricted, with people required to stay at a depth no deeper than chest height.
- Increased attention to lifeguards – all bathers must strictly observe whistle signals and immediately obey verbal instructions from duty lifeguards.
Red flag on the sea
The red flag is the highest degree of warning at the beach and signals a real danger to the life of anyone who enters the water. When it is raised, swimming is absolutely and unequivocally prohibited, with no exceptions made for anyone – regardless of their physical fitness or swimming abilities.
What do you see
On the surface, the sea usually appears rough, with huge waves over 3-4 metres, strong surf and a fierce wind that literally drags the sand from under your feet. However, sometimes the weather can be sunny and calm, but the flag is still red – this visual calm is most deceptive, as it is a clear sign of residual swell after a storm or the presence of dangerous water pollution.
What is happening under the surface
Even when the surface appears deceptively calm, deadly underwater forces can be at work in the depths; the most common reason for a red flag is what is known as a rip current. It forms strong, narrow corridors of pulling currents that move at tremendous speed back towards the open sea and can drag even a professional swimmer out to sea in seconds, and attempts to swim against them lead to rapid exhaustion.
What are the penalties for not following the rules?
Entering the water when a red flag is flying is not merely a display of irresponsibility but an administrative offence under Bulgarian legislation. Lifeguards have the right to request assistance from the Ministry of Interior organs and the beach patrol, and offenders are subject to significant fines, in addition to which they will be forcibly removed from the beach area. ## White and Black Flag at Sea
Many still remember the times when the signalling along the Bulgarian Black Sea coast looked very different. Until the adoption of the new Ordinance on Water Rescue Activities in July 1996, an old flag system was used in our country. Back then, a white flag indicated calm seas and free swimming, the red colour was a warning, and a black flag imposed an absolute prohibition on entering the water.
In order to align with international safety standards, Bulgaria transitioned in 1996 to the „traffic light“ model known today (green, yellow, and red).
It is extremely important for tourists to know and be guided solely by the current colour system for signals, as the correct interpretation of modern flags is the only way to guarantee safety and avoid incidents on the beach.
Other types of flags
In addition to the standard three-colour safety system, other types of flags are used on international and some specialised beaches. These additional signs provide specific information about beach zoning, ecological status, or particular dangers in the water.
- The Blue Flag is a globally recognised eco-certificate awarded to beaches with exceptionally clean water, excellent infrastructure, and environmental protection.
- Yellow-red flag (divided horizontally) – indicates the exact boundaries of the area protected by lifeguards and where it is safest to swim.
- Black and white flag (chequered) – marks an area designated for water sports such as surfing and windsurfing, where swimming by tourists is prohibited to avoid collisions.
- The purple flag warns of dangerous marine fauna in the water – such as venomous jellyfish, stingrays or sea urchins.
The sea is a responsibility
The beach flag is not just a piece of cloth, but a direct message from the lifeguards to each of us. The sea possesses immense and unpredictable power that demands respect, not unnecessary overconfidence.
Before you unfurl your towel and head for the cool waves, take three seconds to look towards the lifeguard station and align your plans with the coloured signal. Your awareness and discipline are the best insurance for an unforgettable, happy, and peaceful summer.
