Gereby is the former name of a German

Germany

Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

 place nowadays called Carlsburg. It is situated in Schwansen

Schwansen

Schwansen is a peninsula in Schleswig-Holstein, Germany, protruding into the Baltic Sea. It is located between the Eckernförde Bay in the south and the Schlei inlet in the north....

 at the northern borderline to Angeln

Angeln

Modern Angeln, also known as Anglia , is a small peninsula in Southern Schleswig in the northern Schleswig-Holstein, Germany, protruding into the Bay of Kiel...

 (engl. Anglia

Anglia

Anglia may refer to:* The mediaeval, late Latin, Hungarian and Polish name for England* A name for the eastern part of England, more commonly, and more accurately, known as East Anglia* Kingdom of East Anglia, one of the kingdoms of the Heptarchy...

). Today Carlsburg is a settlement on the Schlei

Schlei

The Schlei is a narrow inlet of the Baltic Sea in Schleswig-Holstein in northern Germany. It stretches for approximately 20 miles from the Baltic near Kappeln and Arnis to the city of Schleswig. Along the Schlei are many small bays and swamps...

 inlet, some 10 km south of the city of Kappeln

Kappeln

Kappeln is a town in the district of Schleswig-Flensburg, in Schleswig-Holstein, Germany. It is situated on the north bank of the Schlei, approx. northeast of Schleswig, and southeast of Flensburg....

. Located on Carlsburg is Schloss Carlsburg, a country manor owned by the present Duke of Schleswig-Holstein and the former location of a boarding school (Landerziehungsheim Carlsburg) which has since moved to Louisenlund, near Fleckeby.

Gereby is said to be founded by the Vikings in order to defend their way to Hedeby

Hedeby

Hedeby |heath]]land, and býr = yard, thus "heath yard"), mentioned by Alfred the Great as aet Haethe , in German Haddeby and Haithabu, a modern spelling of the runic Heiðabý was an important trading settlement in the Danish-northern German borderland during the Viking Age...

. The name probably derives from the surname "Gero".