Hidden deep in Colombia’s jungles flows a river that looks like it has been painted by an artist’s brush. Called Caño Cristales, it is often nicknamed the River of Five Colours. Between June and November, the waters explode into shades of red, yellow, green, blue, and even purple. But this rainbow isn’t from minerals or dyes — it comes from a rare aquatic plant called Macarenia clavigera.During the rainy season, the plant thrives under just the right amount of sunlight. Too much water and the colours fade; too little, and the plants dry out. But in this perfect balance, the riverbed glows with vivid hues, while the clear water rushing over rocks makes the colours shimmer like moving glass. From above, it looks as though a rainbow has fallen into the water and melted.For centuries, Caño Cristales was a secret, known mostly to local communities living in the Serranía de la Macarena region. Today, it attracts travellers from across the world who trek through thick forests to see the phenomenon. Despite its beauty, it remains fragile — visitors must follow strict rules, such as not wearing sunscreen or insect repellent, because chemicals could harm the delicate plants.The river is more than just a natural wonder. To many Colombians, it symbolises resilience and peace in a country that has seen decades of conflict. For scientists, it shows how tiny plants can transform entire landscapes. And for young dreamers, it’s proof that the Earth holds magical surprises in the most unexpected corners.So while most rivers are blue or muddy brown, Colombia has one that breaks the rules — a river that carries a rainbow in its waters..The river lasts only a seasonCaño Cristales shows its colours only between June and November when conditions are just right..A tiny plant makes the coloursThe aquatic plant Macarenia clavigera is what gives the river its red, yellow, green, blue, and purple hues..A hidden home of wildlifeThe river flows through Serranía de la Macarena, a hotspot of jaguars, monkeys, and rare birds..Tourists must follow strict rulesVisitors are not allowed to wear sunscreen or insect repellent in the water to protect the plants.
