Strandzha (, also transliterated as Strandja; ) is a mountain massif in southeastern Bulgaria and the European part of Turkey, in the southeastern part of the Balkans between the plains of Thrace to the west, the lowlands near Burgas to the north and the Black Sea to the east. Its highest peak is Mahya Dagi (, Mahiada) in Turkey, while the highest point on Bulgarian territory is Golyamo Gradishte . The total area of the massif is approximately . The name of the massif allegedly derives from Istranca, the former name of the Municipality of Binkiliç in Çatalca district, Istanbul province.