The Lower Silesian section of the Sudetes comprises the Jizera Mountains ( highest peak : Wysoka Kopa , ) , where the tripoint with Upper Lusatia and Bohemia is located near the Smrk summit , along with the adjacent Karkonosze Krkonoše ( , also known as in ) ( highest : border peak of Sněžka Śnieżka – highest mountain of Czech Republic , ) ; Rudawy Janowickie ( Skalnik , ) ; Owl Mountains ( Wielka Sowa , ) ; Stone Mountains ( Waligóra ) ; Wałbrzych Mountains ( Borowa ) and the Kaczawskie Mountains ( Skopiec , ) with Ostrzyca , - they surround the Jelenia Góra valley , ; Ślęża Massif ( Mount Ślęża ) , massive of Orlické hory , Králický Sněžník south of historical Kladsko ) , Rychlebské hory and Jeseníky ( ( Praděd , ) .