Seven lakes, one forested valley
The defining feature of Yedigöller National Park is right there in the name: seven small lakes — Büyükgöl, Deringöl, Seringöl, Nazlıgöl, İncegöl, Küçükgöl, and Sazlıgöl — scattered through a single forested valley in Bolu province. Unlike glacial lakes or reservoirs, every one of these formed the same way: a landslide on the valley's steep, unstable slopes dammed a stream, and over time the trapped water settled into a still pool. That shared origin gives the park its geological identity, and the fact that seven such lakes sit within one compact, walkable area is what makes Yedigöller unusual even among Turkey's many scenic lake destinations.
Walking trails and boardwalks connect most of the lakes, threading through dense stands of beech, oak, hornbeam, and maple that turn the whole valley into a mirror of red and gold each autumn. Some lakes sit right beside the main road and parking areas; others require a genuine forest walk to reach, which means the park rewards visitors who are willing to go beyond the first, most accessible viewpoint.
Büyükgöl — the main lake
Büyükgöl, meaning "Big Lake," is the largest of the seven and the one most visitors see first. It sits close to the park entrance, ringed by picnic tables, camping spots, and the clearest views of the surrounding canopy. On calm days the still surface reflects the forest slopes almost perfectly, and this is the classic postcard shot most visitors associate with Yedigöller. Because of its size and easy access, Büyükgöl also tends to be the busiest lake, particularly on autumn weekends, so early mornings offer the best combination of light and quiet.
Deringöl and Seringöl
Deringöl ("Deep Lake") and Seringöl sit further into the valley, reached by walking trails that wind through denser forest than the immediate area around Büyükgöl. Deringöl is notably darker and more shaded, tucked beneath a steeper canopy that keeps direct sun off the water for much of the day — a striking contrast to the brighter, more open feel of Büyükgöl. Seringöl, smaller and quieter, is often where visitors report their best wildlife sightings, since fewer people make it this far along the trail.
Nazlıgöl, İncegöl, and Küçükgöl
These three lakes are smaller and more intimate, each a short detour off the main trail network. Nazlıgöl ("Coy Lake") and İncegöl ("Slender Lake") are narrow, elongated pools framed tightly by tree trunks, offering some of the most atmospheric, forest-enclosed views in the park — especially photogenic when low autumn light filters through the canopy. Küçükgöl, as its name suggests, is the smallest of the group, easy to miss without a map but worth the short walk for visitors who want to see all seven.
Sazlıgöl — the reedy lake
Sazlıgöl ("Reedy Lake") takes its name from the marsh grasses and reeds that fringe its shallow edges, giving it a different character from the deeper, more forested pools elsewhere in the park. Its reedy margins attract waterbirds and make it one of the better spots in Yedigöller for quiet birdwatching, particularly in the early morning or late afternoon when the park is at its calmest.
Walking the trail network
A network of marked paths and boardwalks connects the lakes, with distances short enough that most visitors can see several lakes in a single half-day walk. Büyükgöl and its immediate surroundings are the easiest stretch, largely flat and well-maintained; reaching Deringöl, Seringöl, and the smaller lakes further in involves more uneven forest track, though nothing that requires technical hiking experience. Sturdy walking shoes are recommended year-round, and the trails can be slick with fallen leaves in autumn or muddy after rain in spring, so pace yourself accordingly rather than rushing between viewpoints.
For orientation before you arrive, our Yedigöller map guide lays out the trail layout and lake positions in more detail, and the wildlife page covers what you might encounter — red deer, wild boar, and forest birds — as you move quietly between the lakes.
When to see the lakes at their best
Each lake looks different depending on the season. In autumn, the forest surrounding all seven lakes turns to deep red, orange, and gold, typically peaking from mid-October into November, and this is when Yedigöller draws its largest crowds and its most striking photographs. In spring, meltwater swells the streams feeding the lakes and the forest floor fills with wildflowers; in summer, thick green canopy keeps the trails shaded and cool even on hot days. Our autumn colors guide and best time to visit page go into more detail on timing a trip around the season that matters most to you.
Planning a lake-by-lake visit
If you only have a few hours, focus on Büyükgöl and the short walk toward Deringöl, which together capture the classic Yedigöller scene without requiring a full-day hike. Visitors with more time — especially those camping overnight in the park — can realistically walk to all seven lakes across a day, pacing themselves to catch the smaller, quieter pools like Nazlıgöl and Sazlıgöl in the softer light of early morning or late afternoon, when the forest is at its most reflective and the crowds at their thinnest.