The Rainbow River is locally known as **Caño Cristales**, located in the **Serranía de la Macarena** in **Colombia**.
- It is often referred to as the **“River of Five Colors”** or **“Liquid Rainbow”** due to its stunning natural coloration, caused by aquatic plants called **Macarenia clavigera**.
- The river displays brilliant colors like red, yellow, green, blue, and black, especially visible between **July and November**.
- Frequently mentioned in **geography MCQs, natural wonders, and travel-related competitive exams**.

**Remember:** **Caño Cristales = Rainbow River = Colombia**.