In the east there is a Dutch Low Saxon dialect area, comprising the provinces of Groningen, Drenthe and Overijssel, and parts of the province of Gelderland as well. The IJssel river roughly forms the linguistic watershed here. This group, though not being Low Franconian and being close to the neighbouring Low German, is regarded as Dutch, because of a number of reasons. From the 14th to 15th century onward, its urban centers (Deventer, Zwolle and Kampen as well as Zutphen and Doesburg) have been increasingly influenced by the western written Dutch and became a linguistically mixed area. From the 17th century onward, it was gradually integrated into the Dutch language area. In other words, this group is Dutch synchronically but not diachronically.[citation needed]