Sweet chestnut of Gölcük Highland  The sweet chestnut of Gölcük Highland () is a very old chestnut tree in Izmir Province, western Turkey. It is a registered natural monument of the country. The chestnut tree is located at Gölcük Highland in Ödemiş district of Izmir Province. It is a sweet chestnut ("Castanea sativa"). The tree is high, has a circumference of at diameter. Its age is dated to be about 600 years old. The tree was registered a natural monument on September 27, 1994. The protected area of the plant covers .