NORTH FORELAND, in the Isle of Thanet, Kent, of which it is the north-eastern point, is the promontory ascertained by act of parliament to be the most southern part of the port of London, which is thereby extended north in a right line to the point called the Nose on the coast of Essex, and forms what is properly called the Mouth of the Thames. A sea-mark was erected here by the Trinity-house corporation, at the public expense. All vessels which pass on the south side of this head-land are said to enter the Channel; and all the towns or harbours between London and this place, whether on the Kentish or Essex shore, are called members of the port of London.