The Guadiana River is one of the longest rivers in the Iberian Peninsula, flowing approximately 744 kilometers. It originates in the Sierra de Cuenca mountains in Spain and travels southwest, forming part of the border between Spain and Portugal before emptying into the Atlantic Ocean. The river is significant for its ecological and economic contributions. It supports various wildlife habitats and is vital for irrigation in the surrounding agricultural areas. Additionally, the Guadiana has historical importance, with several ancient towns and cities, such as Mérida and Badajoz, located along its banks.