Zelenicky Vrch, Mountain summit in Northern Bohemia, Czech Republic

Sellnitzer Berg is a phonolite hill rising to 455 m above sea level about 4 km southwest of Bílina, on the cadastral boundary of Želenice and Liběšice. Its slopes show frost weathering forms such as frost cliffs and boulder streams, and an active quarry on the north wall is closed to the public.

The hill is a volcanic laccolith of sodalite phonolite, with rock estimated at 33 million years old. Its phonolite has been quarried on the northern wall by the Keramost company for use in the glass industry. Test boreholes in the quarry have made it the most thoroughly geologically studied summit in the České středohoří.

The Czech name Želenický vrch comes from the village of Želenice at the hill's northern foot; the German Sellnitzer Berg translates it. The phonolite quarried on the north wall by Keramost serves the glass industry as a melting additive. The site is closed to the public for safety.

The summit lies in the Želenice cadastre, with the cadastral border running across the very top at 455 m. Road No. 13 (E442) from Most to Bílina passes along the northern foot, and the village of Želenice is less than a kilometre away. The northern wall holds a working Keramost quarry, so the site is closed to the public for safety reasons.

The mountain carries two names reflecting the mixed heritage of this border region and its linguistic history. This dual naming remains visible today on maps and in local hiking guides.