Because the 19th century classification nomenclature was based primarily on historical territories rather than linguistic clusters, the traditional system can imply greater similarities between dialects than is linguistically warranted. The best-known example of this phenomenon is found within the Franconian cluster, which is divided into Low Franconian, Middle Franconian and Upper Franconian eventhough the Low Franconian (i.e. Dutch) dialects are not most closely related to Middle and Upper Franconian dialects within the larger continuum. In fact, of all German dialects the Low Rhenish-dialect (the only Low Franconian dialect spoken in Germany itself) is the most divergent when compared to Standard German, whereas the Middle and Upper Franconian dialects are fairly similar in their overal structure and phonology to the German standard language.