 Near the eastern edge of a valley surrounding the Chenango River, NY 320 briefly turns eastward, running along the Norwich–North Norwich town line and crossing over Thompson Creek, a tributary of the Chenango River.After a quarter-mile (0.4 km), NY 320 curves back to the northeast and fully enters North Norwich.The route loosely parallels Thompson Creek as it runs uphill from the Chenango River valley, passing gradually fewer homes as it ascends in elevation.