Blagoevgrad Valley to the south-west. Five saddles link Rila to the surrounding mountain ranges – Klisura Saddle (1,025 m) with Verila to the north-west, Borovets Saddle (1,305 m) with Sredna Gora to the north, Yundola (1,375 m) and Avramova Saddles (1,295 m) with the Rhodope Mountains to the south-east and Predel Saddle (1,140 m) with Pirin to the south. Within these limits Rila spans an area of 2,629 km2 and has an average elevation of 1,487 m. The high elevation zone over 1,600 m forms about 50% of the total territory. There are over 140 main peaks above 2,000 m. With an elevation of 2,925 m at Musala, Rila is the highest mountain range in Bulgaria and the Balkan Peninsula, and the sixth highest in Europe after the Caucasus, the Alps, Sierra Nevada, the Pyrenees and Mount Etna. Musala is the fourth most isolated peak in continental Europe after Mont Blanc, Mount Elbrus and Galdhøpiggen raising at a distance of 810 km from the nearest point of the same elevation. With a prominence of 2,473 m, Musala ranks seventh among Europe's ultra-prominent peaks. Division The mountain range is divided into four distinct parts. East Rila, known also as Musala Rila, is the largest and highest subdivision, situated between the valleys of the rivers Beli Iskar and Belishka. It is formed of two main ridges. The Musala Ridge spans in north–south direction between the valleys of Beli Iskar and Maritsa; the Ibar Ridge runs in west–east direction from the summit of Marishki Chal to the Avramova Saddle. It covers 37% of the mountain's territory and contains the highest summit in the range — Musala (2,925 m), as well as 12 of the 18 summits over 2,700 m — Irechek (2,852 m), Deno (2,790 m), Mancho (2,771 m) and others; there are 46 peaks over 2,100 m. East Rila contains a number of glacial lake groups, including Musala Lakes and Marichini Lakes, as well as the nation's largest ski resort Borovets. Central Rila, known also as Skakavitsa Rila, is the smallest part spanning 9% of the Rila's total area but has the most Alpine character and the highest average elevation — 2,077 m. It stretches between the valleys of the rivers Beli Iskar, Cherni Iskar, Levi Iskar, Iliyna and Rilska. The later divides the two main ridges in Central Rila, Skakavitsa and Rilets. The highest summit is Cherna Polyana (2,716 m); other