Lyulin Mountain in the context of "Plana (mountain)"

Plana (Bulgarian: Плана) is a mountain range in western Bulgaria with an altitude of 1,337 meters above sea level. It is part of the Srednogorie mountain system that from west to east includes the mountain ranges of Greben, Zavalska Planina, Viskyar, Lyulin, Vitosha, Plana and Sredna Gora. Plana Peak in Tangra Mountains on Livingston Island, Antarctica is named after it.

Pernik (Bulgarian: Перник [ˈpɛrnik]) is a town in western Bulgaria (about 20 kilometres (12 miles) south-west of Sofia) with a population of 70,285 as of 2021. Pernik is the most populated town in western Bulgaria after Sofia. It is the main town of Pernik Province and lies on both banks of the Struma River in the Pernik Valley between the Golo Bardo Mountain, Vitosha Mountain, Lyulin and Viskyar mountains.Pernik is the principal town of Pernik Province – a province in western Bulgaria, which is next to the Serbian border.

Originally the site of a Thracian fortress founded in the 4th century BC, and later a Roman settlement, Pernik became part of the Bulgarian Empire in the early 9th century as an important fortress. The medieval town was a key Bulgarian stronghold during Bulgarian tsar Samuil's wars against the Byzantine Empire in the 11th century, when it was governed by the local noble Krakra of Pernik, withstanding Byzantine sieges a number of times.

Viskyar (Bulgarian: Вискяр) is a mountain range in western Bulgaria with an altitude of 1,136 meters above sea level. It is part of the Srednogorie mountain system that from west to east includes the mountain ranges of Greben, Zavalska Planina, Viskyar, Lyulin, Vitosha, Plana and Sredna Gora. Viskyar Ridge on Greenwich Island in the South Shetland Islands, Antarctica is named after it.