Task: Text Categorization
Input (English): Context: The Grindstone River is a 6.7-mile-long (10.8 km) river of Minnesota a tributary of the Kettle River. Its name is derived either from the Dakota Iŋswú watpá (Small Stones River) or from the Ojibwe Zhiigwanaabikokaa-ziibi (River abundant with grind stones). In Ojibwe Hinckley (Gaa-zhiigwanaabikokaag) is named after this river.The South Fork Grindstone River rises in a wetland complex in Kroschel Township Kanabec County and flows south and east.
Question: The document can be classified to which topic? 
Options: 1)Plant, 2)Film, 3)NaturalPlace, 4)Animal, 5)Company
Output (English): 3