The Guadiana 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 diversity and historical importance. It supports various wildlife habitats and has been a vital water source for agriculture and communities along its banks. The Guadiana also features several dams and reservoirs, which help manage water resources in the region.