Naval regions and districts were the official shore establishment of Nazi Germany's Kriegsmarine during World War II. The Kriegsmarine shore establishment was divided into four senior regional commands, who were in turn subordinated to the operational Navy Group commanders who commanded all sea and shore naval forces within a particular geographical region.[1] Within each naval region were several subordinate naval districts who were responsible for all navy shore activities within their area of responsibility, most significantly were the various German ports of occupied Europe.