The most well known Ripuarian language 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), "Kirchröadsj 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 neighbouring dialects (which are, however, easily noticeable to locals), and increasingly bigger differences between the more distant dialects. 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.