Trojhora, Mountain summit in northern Czech Republic

Dreiberg, also known as Trojhora, is a mountain in northern Czech Republic featuring three distinct peaks visible from multiple directions. The summit sits at coordinates 50.5922919N and 14.1899106E and creates a recognizable shape in the landscape.

Trojhora is a neovolcanic hill in the České středohoří, formed by the exhumation of a deep magmatic body. Its higher summit is made of limburgite, while the secondary summit and lower ridge consist of sodalitic trachyte. The rocky ridge is 150 metres long, and frost weathering has created rock walls, frost-riven cliffs and boulder streams on its slopes.

The name Dreiberg, Czech Trojhora, means "three mountains", referring to the three basalt formations of the summit ridge. The yellow-marked trail from Třebušín to Staňkovice passes below the peak, and a short branch leads up to the summit.

A yellow-marked trail from Třebušín or Staňkovice leads to the summit after a short, steep climb; a branch path leaves the Třebušín–Staňkovice route for the top. The 451 m ridge is 150 m long, and the summit gives an unobstructed view of Kalich, Panna and Sedlo.

The 150-metre rocky ridge was exposed from a deep magmatic body; the higher summit is limburgite, the lower parts sodalitic trachyte. About 300 metres southwest of the summit, beside the forest path to Chudoslavice, stands the protected tree Buk pod Trojhorou.