Belgrad Forest is one of the largest woodlands near Istanbul, and it owes its name to Serbs who were deported here after Suleiman the Magnificent took Belgrade in 1521 and set to tending the city's waterworks. Those works still thread the trees: long stone aqueducts and a chain of reservoir dams, called bents, that once fed spring water to the fountains of the old city. The Kırkçeşme line that ran from here was switched off in the 1940s, so the forest no longer waters Istanbul; today it is one of the city's main green lungs, protected and open to all.
Spread across the hills above Sarıyer, it is a dense cover of oak and beech that stays cool even at the height of summer. A well-worn loop of about six and a half kilometres circles the Neşet Suyu meadows, marked paths link one dam and its still reservoir to the next, and the Atatürk Arboretum on the southern edge burns gold through October and November.