The County of East-Frisia was a county in the region of East Frisia in the northwest of the present-day German state of Lower Saxony.

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.