Rochester, Kent the Blackheath Beds of sand and gravel. As a human settlement, Rochester became established as the lowest river crossing of the River Medway, well before the arrival of the Romans. It is a focal point between two routes, being part of the main route connecting London with the Continent and the north-south routes following the course of the Medway connecting Maidstone and the Weald of Kent with the Thames and the North Sea. The Thames Marshes were an important source of salt. Rochester's roads follow north Kent's valleys and ridges of steep-sided chalk bournes. There are four ways out of
St. Jones River is fed by Fork Branch, Penrose Branch, and Maidstone Branch. From Silver Lake, the St. Jones River flows generally southeastwardly, along the east side of downtown Dover and past Legislative Hall, the Capital Square/Legislative Mall, and the Dover Air Force Base to Bowers, where it flows into Delaware Bay, approximately north of the mouth of the Murderkill River. The lower course of the river southeast of Dover is surrounded by brackish marshes and salt marshes, open water habitats, and wetlands. A portion of the lower river, along with nearby Blackbird Creek, have received federal protection as the Delaware National Estuarine