This area includes Cilacap, Kebumen, Banjarnegara, Purbalingga, Banyumas, Pemalang, Tegal, and Brebes regencies, together with independent cities within that region.

Scholars divide the development of Javanese language into four different stages: The phases above were influenced by the emergence of empires in Java.

In the Banyumasan region, high grades are usually used only when speaking to a stranger assumed to come from the eastern area of Java i.e. Yogyakarta / Surakarta etc., or on certain occasions.

The Tegalan dialect is spoken in northern areas of Banyumasan: Tanjung, Ketanggungan, Larangan, Brebes, Slawi, Moga, Pemalang, Surodadi, and Tegal.

The Banyumasan dialect is spoken in southern areas: Bumiayu, Karang Pucung, Cilacap, Nusakambangan Island, Kroya, Ajibarang, Wangon, Purwokerto, Purbalingga, Bobotsari, Banjarnegara, Purwareja, Kebumen, and Gombong.