Regierungsbezirk Zichenau was a Regierungsbezirk, or administrative region, of the Nazi German Province of East Prussia in 1939–45. The regional capital was Zichenau (Ciechanów).^[1] It was also referred to under the designation of South East Prussia (German: Südostpreußen) which, however, was later sometimes also applied to Bialystok District, although the latter was not incorporated into, but merely attached to East Prussia.

History

The government region was created on 26 October 1939, out of Polish areas annexed by Nazi Germany during World War II. The region had an area of 12,000 km² and a population of approximately 895,000, including 800,000 Poles, 80,000 Jews, and 15,000 Germans.

Regierungsbezirk Zichenau was dissolved in 1945 when East Prussia was overrun by the Soviet Red Army. The territory was then restored to Poland.

Rural districts

1. Mackeim district (Maków Mazowiecki)
2. Mielau district (Mława)
3. Ostenburg district (Pułtusk)
4. Plöhnen district (Płońsk)
5. Praschnitz district (Przasnysz)
6. Scharfenwiese district (Ostrołęka)
7. Schröttersburg district (Płock)
8. Sichelberg district (Sierpc)
9. Zichenau district (Ciechanów)