The most famous member is Kölsch, the local dialect of Cologne. Dialects belonging to the Ripuarian group almost always call themselves Platt like Öcher Platt (of Aachen) or Eischwiele Platt (of Eschweiler), Kirchroadsj Platt (of Kerkrade) Bocheser Platt (of Bocholtz) or Bönnsch Platt (of Bonn). Most of the more than one hundred Ripuarian dialects are bound to one specific village or municipality. Usually there are small distinctive differences between neighboring dialects (which are however easily noticeable to locals), and increasingly bigger ones between the more distant ones. These are described by a set of isoglosses called the Rhenish fan in linguistics. The way people talk, even if they are not using Ripuarian, often allows them to be traced precisely to a village or city quarter where they learned to speak.