Geology of Kent to uplift, sedimentation, and marine erosion. The Isle of Thanet was till recently (AD 960) an island, formed around a deposit of chalk. The channels silted up with alluvium. Similarly Romney Marsh 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
HMS Maidstone (1937) the land, entry to the jetty being guarded by sand-bagged army emplacements. "Maidstone" was also notable for a successful escape by seven Provisional IRA members on 17January 1972. The men swam close to through icy water and evaded army and police only to later hold a press conference. On 23 May 1978 "Maidstone" was broken up for scrap at the Thos W Ward scrapyard in Inverkeithing. HMS Maidstone (1937) HMS "Maidstone" was a submarine depot ship of the Royal Navy. She was built to support the increasing numbers of submarines, especially on distant stations, such as the Mediterranean and the