Kent is a county in South East England and one of the home counties. It borders Greater London to the north-west, Surrey to the west and East Sussex to the south-west. The county also shares borders with Essex along the estuary of the River Thames (connected by land via High Speed 1 and the Dartford Crossing), and with the French department of Pas-de-Calais through the Channel Tunnel. The county town is Maidstone.