Kniebis-Alexanderschanze, Protected area in Baiersbronn and Freudenstadt, Germany.

Kniebis-Alexanderschanze is a protected nature reserve in the northern Black Forest between Baiersbronn and Freudenstadt. The area spans elevations from around 730 to 970 meters and consists of meadows, wetlands, and grasslands interspersed with rocky terrain.

The area was designated a nature reserve by decree of the Karlsruhe regional council on 18 December 1996, originally covering about 190 hectares under reserve number 2.207. In 2014, section 19 of the National Park Act reduced the protected area to 134.6 hectares, leaving the open land south of the Schwarzwaldhochstraße (B500) and around the Altbadischer Kniebis south of the B28.

The name Alexanderschanze comes from a historic fortification, the Bodendenkmal protected within the reserve. The open grasslands are the product of extensive farming, maintained today to keep the heath and wet meadows from reverting to forest.

The reserve lies on both sides of the Schwarzwaldhochstraße (B500) and the B28 near the altbadisches Kniebis, with open heath south of the roads. Paths cross boggy, grassy ground and old stone rows, so waterproof footwear helps. The area is part of the 36,045-hectare Nordschwarzwald bird sanctuary, and parts now fall inside the Black Forest National Park.

The reserve provides habitat for specialized animal species adapted to extreme conditions, including rare grasshoppers and vipers. These creatures rely on the rocky formations and wetlands as essential refuge areas.