The beaches of Hormuz Island in Iran have once again caught global attention after turning a deep blood-red colour following recent heavy rainfall. The unusual sight looked almost unreal, leaving many people surprised and curious. However, experts say this dramatic change is completely natural and has happened many times before on the island.
Hormuz Island is located in the Persian Gulf, close to the Strait of Hormuz. It is already known for its unique and colourful landscape, which is why it is often called the “Rainbow Island”. When heavy rain falls on the island, water flows down from its hills and mixes with the island’s iron-rich soil and rocks. This causes the beaches and nearby seawater to turn shades of red.
The scene in Hormuz Island, off Iran's coast, following heavy rainfall earlier today. pic.twitter.com/Wu6zxDUIkm
— Joe Truzman (@JoeTruzman) December 16, 2025
Scientists explain that the red colour comes from iron oxide, especially a mineral called hematite. Hematite is a natural form of iron and is also the reason why the planet Mars looks red. When rainwater washes over soil that contains a large amount of this mineral, it carries tiny iron particles down to the coast. These particles stain the sand and shallow seawater, giving the area a red or rust-like appearance.
During rainfall, the water creates small streams and erosion paths that carry these minerals toward the sea. As a result, large parts of the beach appear painted red. Once the rain stops and the water clears, the colour slowly fades, showing that the phenomenon is temporary and harmless.
Local residents and tourists often take photos and videos of this rare sight, and it has become a popular attraction for photographers, nature lovers, and scientists. Experts say the red water does not pose any danger to people. However, they also point out that continued erosion over many years could slowly change the shape of the island.
Hormuz Island is rich in minerals such as iron ore, ochre, gypsum, and salt, formed over millions of years. These minerals have long been used by locals, especially for making traditional pigments. This gives the island both cultural and economic importance.
The red beaches of Hormuz Island show how rain, minerals, and geology can combine to create breathtaking natural scenes. Even though the colour lasts only for a short time, it turns the island into a stunning natural artwork, reminding people of the powerful and beautiful forces of nature.
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