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
Maidstone, Vermont the southwest, Ferdinand to the northwest, and Brunswick to the north, all in Vermont. Across the Connecticut River are the New Hampshire towns of Stratford to the northeast and Northumberland to the east. The only crossing of the Connecticut River from Maidstone is the Janice Peaslee Bridge in the northern part of town, leading to Stratford village. Vermont Route 102 travels the length of the east side of town, staying in the Connecticut River valley. According to the United States Census Bureau, the town has a total area of , of which is land and , or 5.39%, is water.