Task: Text Categorization
Input (English): Context: The Elvo (Piedmontese: Elv) is a 53 km torrent (an intermittent stream) in the Piedmont region of north-west Italy and is the principal tributary of the Cervo. It runs through the communes of Sordevolo Occhieppo Superiore Occhieppo Inferiore Cerrione and Salussola in the Province of Biella and of Carisio and Casanova Elvo in the Province of Vercelli. The river’s valley is named after it as the Valle dell'Elvo.
Question: The document can be classified to which topic? 
Options: 1)Athlete, 2)Animal, 3)MeanOfTransportation, 4)Album, 5)NaturalPlace
Output (English): 5