Geography of Kent and Dungeness have been formed by accumulation of alluvium. Kent's principal river, the River Medway, rises near Edenbridge and flows some 25 miles (40 km) eastwards to a point near Maidstone, when it turns north. Here it breaks through the North Downs at Rochester before joining the River Thames as its final tributary near Sheerness. The river is tidal as far as Allington lock, but in earlier times cargo-carrying vessels reached as far upstream as Tonbridge. The Medway has captured the head waters of other rivers such as the River Darent. There are other rivers in Kent, most notably the
Zumbro River The North and South forks join about east of Mazeppa in southwestern Wabasha County, and the Zumbro River flows eastwardly through Wabasha County, through the Richard J. Dorer Memorial Hardwood State Forest and past Zumbro Falls, Hammond, Millville and Kellogg. It flows into the Mississippi River about east of Kellogg. Some species of fish that can be found in the Zumbro River near Rochester include Green Sunfish, Rock Bass, Smallmouth Bass, Largemouth Bass, Common Carp and Creek Chub, Channel Catfish, Blue Catfish, Northern Pike. Zumbro River The Zumbro River is a tributary of the Mississippi River in the Driftless Area