巴尔干山脉

巴尔山脉），又称老山山脉

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外部連結

• [https://web.archive.org/web/20081229223507/http://www.stara-planina.net/ Regional tourist association]
• [https://web.archive.org/web/20190308002938/http://euroregion-sp.eu/ Euroregion Stara Planina]
• [http://bulgariawalking.com/p135-Balkan_Mountains Hiking in Balkan Mountains]
• [https://web.archive.org/web/20091222033700/http://www.ptica.org/newsletter/Skislopes_WorldBirdWatch_March_2009_lowres-3.pdf Controversy regarding ski resort development in ostensibly protected areas. (World Birdwatch, March 2009)]
• [https://web.archive.org/web/20081229223507/http://www.stara-planina.net/ Tourist portal Stara Planina ]