length is . Many parts of Velebit would not be reachable without it. The Velebit mountains are transversed by the A1 through the Sveti Rok Tunnel. Peaks and areas of Velebit Zavižan area – North Velebit (Mali Rajinac) (1699 m) Rožanski Kukovi group – North Velebit (Gromovaca (1676 m) and Vratarski Kuk (1676 m) Alančić, Rožanski Vrh, Seravski Vrh, North Velebit (Goli Vrh (1670 m) Veliki Kozjak (1629 m), North Velebit Šatorina (1624 m) – Mid Velebit Stap area – South Velebit, (Debeli Kuk) (1269 m) Visočica (1619 m) – South Velebit Bojin Kuk (1110 m) – South Velebit Viserujna (1632 m) and Rujno – South Velebit Paklenica area – South Velebit Vaganski vrh (1757 m) – South Velebit (highest peak of Velebit) Liburnija (1710 m) – South Velebit Sveto Brdo (1751 m) – South Velebit Tulove Grede (1120 m) – Southeast Velebit Crnopac (1404 m) – Southeast Velebit Around 70 peaks exceed 1600 m. The caves There are hundreds of "holes" on Velebit. It has the largest and deepest caves in Croatia. The three-part "Lukina jama" cave is 1392 m deep, making it one of the deepest caves in the world, and the deepest in southeast Europe, while the "Slovačka jama" is 1320 m. What makes it unique is that it is completely vertical, steepest in the world. At the bottom of the pothole is a water course or siphon with branches that are still unexplored. A kind of leech was discovered in the pothole, which has been ascertained to represent a new species, genus and family; it has been named Erpobdella mestrovi. List of potholes on Velebit deeper than 500 m: Lukina Jama, 1392 m, Hajdučki Kukovi – North Velebit Slovačka Jama, 1320 m, Rožanski Kukovi – North Velebit Velebita, 941 m, Rožanski Kukovi – North Velebit Meduza, 679 m, Rožanski Kukovi – North Velebit Patkov Gušt, 553 m, Hajdučki Kukovi – North Velebit Ledena Jama, 536 m, Lomska Duliba – North Velebit Ponor na Bunovcu, 534 m, Bunovac – South Velebit Jama Olimp, 531 m, Hajdučki Kukovi – North Velebit Lubuška Jama, 521 m, Hajdučki Kukovi – North Velebit It is also home to Degenia velebitica, an endemic and protected species of plant in the mustard family discovered in 1907 by the Hungarian botanist Árpád von Degen. The imposing nature of the Velebit mountain has made it something of a national symbol in Croatian folklore. There is