Mountains constitute a significant part of Bulgaria and are dominant in the southwest and central parts. Bulgaria's highest mountains are Rila (highest peak Musala, 2925 m; the highest in the Balkans) and Pirin (highest peak Vihren, 2914 m). The large mountain chain of Stara planina (Balkan Mountains) runs west–east across the entire country, bisecting it and giving the name to the entire Balkan peninsula. Other extensive mountains are the massifs Rhodopes and Strandzha in the south.