Prosnitzer Schanze, Archaeological fortress in Gustow, Germany.

Prosnitzer Schanze is an earthwork fortification on the southwest coast of Rügen, about 8 km southeast of Stralsund. It consists of an almost rectangular inner space of about 80 by 60 metres enclosed by a rampart, with a water-filled moat on the east and north sides crossed by a bridge on the north. The main rampart outside the moat had two hornworks and was reportedly piled up to 10 metres high. No masonry remains; the site is overgrown and hard to access, though aerial photographs still show its geometric form.

The fortress was built in the 17th century in response to conflicts in the Baltic region and played a role during the war between Sweden and Brandenburg from 1674 to 1679. The change of rulers left marks on the construction and structure of the site.

The names tell the site's story: Neufährschanze recalls the ferry that once crossed the Strelasund here, Gustower Schanze refers to the nearby village of Gustow, and Fort Napoleon dates from the French expansion begun in 1812. The earthworks are protected as a Bodendenkmal of Mecklenburg-Vorpommern, so digging or collecting finds requires a permit and chance finds must be reported to the monument authority.

The ramparts are well preserved but heavily overgrown and hard to reach; the interior buildings survive only as rubble. The site lies on the Bodendenkmal list, so searching for or collecting finds requires a permit and chance finds must be reported to the heritage authority. Aerial photographs still show the exact geometric outline.

The site is a protected Bodendenkmal under Mecklenburg-Vorpommern's monument law, listed as find site Prosnitz 15 with the names Prosnitzer Schanze, Neufährschanze and Fort Napoleon. Research and deliberate collecting of finds require a permit, and chance finds must be reported to the monument authority.