Why are Barranquilla's beaches so brown?

Barranquilla's beaches are brown primarily due to the high sediment load carried by the Magdalena River, which flows into the Caribbean Sea nearby. The river transports organic materials, silt, and sediment from inland areas, leading to the distinct coloration of the coastal waters. Additionally, urban runoff and pollution can contribute to the brown appearance of the beaches. These factors combine to create the unique coastal environment observed in Barranquilla.