Originating from an altitude of 450 meters in Kengtou Mountain, Neihu District, the Neigou River flows southeastward and empties into Keelung River at approximately 500 meters upstream from Nanhu Bridge. This 6,817-meter long river occupies an area of 422 hectares with a 41% average slope in the catchment area; it is known for numerous interesting spots on the forested hillside of Taipei City. In addition to the stones piled up to form gaps that provide habitats for aquatic animals, Neigou River gives the general public greater access to some waterfront fun.