Kent coastline of Kent is continuously changing, due to tectonic uplift and coastal erosion. Until about 960, the Isle of Thanet was an island, separated by the Wantsum channel, formed around a deposit of chalk; over time, 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 East Grinstead in Sussex and flows eastwards to Maidstone. Here it turns north and breaks through the North Downs at Rochester, then joins the estuary of the River Thames as its final tributary near Sheerness. The Medway is
KMFM Maidstone the hospital radio station, Maidstone Festival Radio set up their own studio before later changing the station's name to CTR FM (County Town Radio). At the request of the Radio Authority, it was rebranded a second time to 20/20fm (after the A20 and M20 trunk roads that run through the area), following concerns that the station could be confused with the similarly named 106CTFM which had just launched a full-time service in Canterbury. Six applications were filed for a new Maidstone and Mid-Kent licence by January 2003, with the winning application being declared as Maidstone Radio Ltd (20/20fm) in the