Task: Text Categorization
Input (English): Context: The Mangere River is a river of the Northland Region of New Zealand's North Island. It flows generally westwards from its sources in hills northwest of Whangarei meeting the Wairua River 10 kilometres northwest of Maungatapere.
Question: The document can be classified to which topic? 
Options: 1)Artist, 2)Animal, 3)NaturalPlace, 4)WrittenWork
Output (English): 3