Pirin is the biggest national park of Bulgaria, spanning an area of 26 480 hectares. It occupies regions with well-preserved natural life from the peak of Vihren to an altitude of 1 000 m. Over 60% of its surface are covered with forests. The forests give shelter to very rare tree and animal species. The oldest tree in Bulgaria, called the White Fir of Baickush (Baickusheva Mourra) and more than 1 200 years old, can be seen in the park. On its comparatively small area the mountain…