The area divided by the Berlin-Spandau Ship Canal opened in 1859 was located at the outskirts of the Tegel forest northwest of the Berlin city limits in the Province of Brandenburg. The theologian Johann Hinrich Wichern had established the Evangelical Johannesstift borstal nearby, which in 1905 moved to Spandau–Hakenfelde. In 1915, the lands east of the canal with Plötzensee Lake were incorporated into Berlin (the present-day Wedding district), the remaining area around the prison walls became part of the Berlin Charlottenburg borough upon the 1920 Greater Berlin Act.