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.

Baltrum is a barrier island off the coast of East Frisia, in Germany, and is a municipality in the district of Aurich, Lower Saxony. It is located in-between the chain of the seven inhabited East Frisian Islands. Baltrum is the smallest island in this chain by area and inhabitants. It has a land area of 6.5 square kilometres, and a population in (2011) of just over 500 resident inhabitants.