Lake Abant exists because a mountainside gave way. A landslide blocked the valley of the Abant Stream, water gathered behind the debris, and what settled there is a natural dam lake — no river built it and no crater holds it — 1,328 metres up in the Bolu mountains, 127 hectares across and nowhere deeper than 18 metres. The ground has not finished moving: the lake lies on the North Anatolian Fault, which ruptured close by in 1957. Fir and Scots pine run all the way down to the waterline, oriental beech and hornbeam mixed through them, and the forest holds the cold even in August. The lake has bred its own life, too. The Abant trout, a red-spotted fish that survives here and in a few neighbouring streams, is now restocked by hand; the Abant crocus was described in 1975 from these slopes and grows wild almost nowhere else. Abant became a nature park in 1988 and, in June 2022, Turkey's 48th national park.
A single asphalt road, seven kilometres long, runs right around the shore, and walking it takes about two hours. For decades that circuit belonged to red horse-drawn carriages; the park banned the horses in 2022, and battery-powered carts now do the round. In autumn the beech turns copper and gold against the black-green of the fir. In winter the lake ices over from the shore inward, sometimes right across, and the shoreline path becomes a walk on snow. Abant is no longer a quiet secret: cars enter through an automatic toll gate, hotels line the approach, and the park counted around 570,000 visitors in 2023, most of them on day trips from Istanbul and Ankara. Come away from the entrance, though, and the shore still goes quiet.