East Frisia or East Friesland is a historic region in the northwest of Lower Saxony, Germany. It is primarily located on the western half of the East Frisian peninsula, to the east of West Frisia and to the west of Landkreis Friesland.

Saterland Frisian, also known as Sater Frisian, Saterfrisian or Saterlandic, spoken in the Saterland municipality of Lower Saxony in Germany, is the last living dialect of the East Frisian language. It is closely related to the other Frisian languages: North Frisian, spoken in Germany as well, and West Frisian, spoken in the Dutch province of Friesland.