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
Maidstone was reported at the time that inhabitants were bitterly opposed to the railway, the mayor suggesting that "Maidstone will be ruined as a commercial town". It was said that wharfingers and corn and coal merchants would be hardest hit. In 1842, the South Eastern Railway, to reach the Channel ports of Folkestone and Dover, put its main line through Tonbridge and Ashford, some to the south. A station named Maidstone Road was built in an isolated spot called Paddock Wood, from where coaches were run to the county town. Two years later a branch line was built to Maidstone. In