Bořeň is a rocky hill perching high above the valley of the Bílina River; in its bottom part it is partly wooded. The peak is 539 metres above sea level. It is a dominant feature not only of the town of Bílina, but also the Central Bohemian Uplands, and thanks to its characteristic shape it is easy recognisable from far away places (such as Žatec); when viewed from the north-west it might remind you of a lion lying down. Bořeň is the largest clinkstone formation in Central Europe. On its rocky slopes you will find many protected plant species such as Basket of Gold, Aster Alpinus, yellow iris, Saxifraga rosacea, Pulsatilla pratensis, Dianthus gratianopolitanus, Primula veris and Daphne mezereum. On the opposite southern slopes of Kaňkov Hill you will find Adonis vernalis. The Eurasian Eagle-owl nests here. Apart from standard bird species, you will find 22 protected especially protected species. The European Green Toad and Smooth snake (Coronella austriaca) are also found here. A national nature reserve was established at Bořeň in 1977. There is a nature trail from Bílina leading all the way to the top from where you will have circular views. In 1996 the trail was made by students of Bílina Grammar School. The trail starts at the Kyselka spa complex in Bílina and takes you through the national nature reserve Bořeň all the way to the top. There are twelve information boards along the trail, giving you information on the geological development, and the flora and fauna of the area.

For climbers, Bořeň is a very important, non sandstone areas in the Czech Republic. The clinkstone rock is in most sectors very strong and it offers a different type of climbing: wall, gap and chimney climbing. Tall faces, especially in the north, offer the possibility of long climbs of a mountainous character. The first climbers came to Bořeň at the beginning of the 20th century, but we do not have any more detailed information. The names of the first known climbers are: Gregor (Řehoř) and Berthold from the Alpine Club in Žatec;the rocky formations of Berthold's Finger and Řehořův Chimney were named after them. In the south you will find the Devil's Pulpit, in the east there is the Stone Waterfall, in the north the Noon Stone and in the west the Bishop's Seat, known also as the Organ. In 1917 there were talks about building a tourist lodge in the foothills of Bořeň. In 1925 it was built by the Bílina Mountaineering Association Gebirgsverein who donated 500 Austrian crowns. Bořeň Lodge with a pub was officially opened in 1928.

Nowadays, it is still used as a B&B and a restaurant. In the past, Bořeň was very popular with tourists who came here to enjoy the romance and beauty of the surrounding countryside. The famous German poet J. W. Goethe came several times and even made sketches of the surrounding area. The famous traveller Alexander Humbolt noted in his diary that he was thrilled with the views and the beauty of the place. There are also several legends connected with the place; the best known one is about the witch of Bořeň.