Blanský les Protected Landscape Area, Nature reserve in South Bohemia, Czech Republic.

Blanský les is a protected landscape area of 220 km² in the Šumava foothills of South Bohemia, declared in 1990 with its administration in Vyšný. Its flat highland massif, built mostly of granulite with inserts of serpentinite and crystalline limestone, wraps in a horseshoe around the deep tectonic basin of the Křemžský potok. Forests cover 55% of the area, and the Vltava cuts its southeastern edge in a canyon about 400 m above sea level.

Blanský les was declared a protected landscape area on 1 January 1990, with its administration based in Vyšný. Within its bounds stand the 13th-century Cistercian monastery of Zlatá Koruna, the ruined Rožmberk castle Dívčí kámen above the Křemžský potok, the unfinished late-Gothic monastery at Kuklov and a Celtic oppidum near Třísov.

The name Blanský les is linked to the medieval castle of the same name, and the area's human traces reach back to a Celtic oppidum near Třísov. Today the administration in Vyšný runs a 2.5 km educational trail through the Vyšenské kopce reserve, with 14 stops, starting in front of its building.

A network of marked trails guides visitors through the protected area, with clear routes leading to key viewpoints and natural features. The Kleť summit is reachable by foot and offers a historic observation tower where visitors can gain broad views of the landscape.

The bedrock is mostly granulite, with unusual inserts of serpentinite and crystalline limestone. These lime and serpentine patches support relict pine stands and rare snails and insects found nowhere else in the area, and the most important sites are separately protected.