The highest peak (744 m) in the area, a part of the Ještěd and Kozákov hills ridge, a 162,83 ha national natural monument established in 1985. The hill is made of three types of rocks – melaphyre (S and SE crown with precious stones findings – in the Votrubcov quarry), sandstone (SW slope, for example, Babí and Kudrnáčova furnace) and basalt (N slopes with quarries ). The Riegrova chalet was built on the top between 1926 and 1928, enlarged in 1939, partially burnt down in 1962 and reopened in 1966. A 40 m viewing tower was opened in 1994 a few steps from the chalet. The view from its accessible gallery is magnificent. You can see in all directions with nothing obstructing the view of Krkonoše, Jizerské and Orlické Mountains, Bohemian Paradise, Bezděz castle, Říp, Milešovka, Ralsko, Klíč and Ještěd hills. Kozákov hill is notorious for paragliding.