Aschberg, Mountain summit in Klingenthal and Bublava, Germany and Czech Republic.

Aschberg (Czech: Kamenáč) is a 936 m mountain in the Ore Mountains on the Saxon-Czech border; its summit lies in the Czech municipality of Bublava, while the state border runs at 917 m. On the German side, just below the summit, stand a 31.91 m observation tower and a youth hostel, and the scattered houses of the Aschbergsiedlung cover the Saxon part of the plateau. The summit itself is a small rock outcrop bearing a square granite column of the Royal Saxon Survey.

Glassmakers came to the western Ore Mountains with miners and hammersmiths to work the quartz veins found at the Aschberg, using the untouched forests for smelting furnaces and for extracting potash from charcoal. The mountain was settled on the Czech side too; after the expulsion of the German population after the Second World War, the buildings south of the summit were dismantled. On the northern slope stood the Curt-A.-Seydel-Schanze ski jump, in use from 1923 to 1940.

The mountain's name comes from the ash trees cleared to fuel glassworks: from the 16th century glassmakers settled the western Ore Mountains and used the quartz veins in the Aschberg and the surrounding forests for smelting furnaces and for extracting potash from charcoal. Scattered mountain farmhouses of the Aschbergsiedlung still stand on the Saxon summit plateau.

Marked hiking trails approach the summit from both the German and Czech sides, with the German section offering an observation tower and youth hostel. The routes remain accessible throughout the year, though winter conditions may present additional challenges.

The summit itself lies on the Czech side, where a small rock outcrop carries a square-section granite column of the Royal Saxon Survey, station 1st order no. 24, now of historical value only. Nearby outcrops show woolsack weathering, the best known being the Tři skálky (Three Rocks).