Wikipedia:
Links to Wikipedia in English: [Süderholm] [Gemeinde Christiansholm] [Landkreis Rendsburg] [Schleswig-Holstein]
(The links above are automatically generated. There is no guarantee that they will lead to the correct page.)

Information in the Genealogical Gazetteer (GOV):
Link to the GOV gazetteer
Link to the genealogy.net wiki (in German)