Please answer the following question: The Cidacos River is a tributary of the Ebro. Its source is Los Campos in Soria and it flows for 77 km (48 mi) until its reaches the Ebro at Calahorra (La Rioja).It flows through or past various towns like Villar del Rio Yanguas Enciso Peroblasco Arnedillo Santa Eulalia Somera and Bajera Herce Arnedo Quel Autol and Calahorra. The river is used for irrigation purposes and is often dried up near Calahorra. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Natural Place