Estuary English a discrete accent distinct from the accents of the London area. The sociolinguist Peter Trudgill has written that the term "Estuary English" is inappropriate because "it suggests that we are talking about a new variety, which we are not; and because it suggests that it is a variety of English confined to the banks of the Thames estuary, which it is not. The label actually refers to the lower middle-class accents, as opposed to working-class accents, of the Home Counties Modern Dialect area". Peter Roach comments, "In reality there is no such accent and the term should be used with
Yalu River its length. Most of the river freezes during winter and can be crossed on foot. The depth of the Yalu River varies from some of the more shallow parts on the eastern side in Hyesan (1 m) to the deeper parts of the river near the Yellow Sea (2.5 m). The estuary is the site of the Amrok River estuary Important Bird Area, identified as such by BirdLife International. About 205 islands are on the Yalu. A 1962 border treaty between North Korea and China split the islands according to which ethnic group was living on each island. North Korea