With its altitude of 726 meters, Sedlo Hill is the fourth highest mountain in the Central Bohemian Uplands and the highest mountain in the Verneřická part of the Central Bohemian Uplands. It is a significant landmark and a unique natural site. Sedlo is a massive volcanic trunk with a sharp peak ridge with numerous rocky outcrops and rubble fields. In the rubble we can find mixed coniferous forests, often of an ancientforest-like character, with massive specimens of lindens, sycamores, beeches and oaks. Rare thermophilic flora grows on rocks with columnar separation facing south. Fieber's leafless iris was first described on Sedlo. The local fauna has a purely forest character.
The top part has been protected as National Natural Reserve since 1968, due to the occurrence of rare flora. Several tourist routs lead to the top of Sedlo. You can go to the top of Sedlo, for example, from Úštěk, Habřina, from Trnobrany, Horní Vysoká or Lovečkovice. There is a lookout point that offers a view to the south, west and east. From the lookout point it is possible to see a number of hills such as Říp, Hazmburk, Radobýl, Košťalov, Vlhošť or Ronov. Ještěd and the Krkonoše ridge are also visible during weather with good visibility.
The saddle consists of two peaks: the higher Saddle, also known as the Great Saddle (726 m) and Malé Sedlo (534 m). The mountain got its name thanks to its shape, because the back resembles an ancient horse saddle from a distance. At the foot of Sedlo are the ruins of Litýš Castle, which was built in the 15th century.