The Río Guadiana is one of the longest rivers in the Iberian Peninsula, flowing approximately 744 kilometers. It originates in the Sierra de Cuenca mountains in central Spain and travels through various regions before emptying into the Atlantic Ocean at the border between Portugal and Spain. The river serves as a natural boundary between the two countries for part of its course. The Guadiana is significant for its ecological and economic contributions. It supports diverse wildlife and provides water for agriculture in the surrounding areas. Additionally, the river is known for its historical importance, having been a vital trade route since ancient times, influencing the development of nearby towns and cities.