Sülüklügöl Nature Park is located in the Yürse area of Mudurnu district in Bolu province and covers an area of approximately 810 hectares. Situated at an altitude of 1,050 meters above sea level, it is accessible via the Bolu–Abant–Taşkesti (85 km), Bolu–Mudurnu–Taşkesti (100 km), and E5–Akyazı–Dokurcun (50 km) routes. The park is located 50 kilometers northwest of Mudurnu.

Sülüklügöl was formed as a result of a major landslide in the year 1703. A large mass of earth slid over Tavşansuyu Stream, blocking the flow and creating the lake. Due to this geological movement, the upper parts of pine and oak trees that remained under the lakebed have stayed standing in the water without decaying to this day. This feature gives the lake a unique landscape character.

^{Sülüklügöl (Ministry of Agriculture and Forestry, 9th Regional Directorate)}

Natural Structure and Ecosystems

Sülüklügöl Nature Park stands out with its lake, wetlands, and surrounding forest. It is home to a wide variety of tree species such as black pine, Scots pine, Uludağ fir, beech, hornbeam, pedunculate oak, sessile oak, Turkey oak, trembling poplar, white poplar, plane tree, linden, maple, alder, wild cherry, and ash. This forested area has been preserved in a natural environment with very limited human impact and has remained unspoiled until today.

In its higher altitude zones, endemic plant species can also be observed, making this area significant from a botanical perspective. The park is also rich in faunal diversity, hosting species such as roe deer, wild boar, brown bear, wolf, fox, rabbit, hawk, and tree frog in their natural habitats. However, the lake no longer contains the leech species from which it takes its name, as these were eradicated over time by fish that were unknowingly introduced into the lake.

^{Natural Structure of Sülüklügöl (Ministry of Agriculture and Forestry, 9th Regional Directorate)}

Protection Status and Management

Sülüklügöl was first declared a Nature Conservation Area on March 25, 1988. Following field evaluations, its status was changed to Nature Park on November 22, 2011. In addition to Sülüklügöl, the main resource values of the park include Kavaklı and Pis lakes and the surrounding forest ecosystems. The park is managed according to principles of sustainable conservation due to its natural landscape, ecological balance, and biological diversity.

Recreation and Infrastructure

Sülüklügöl Nature Park offers suitable opportunities for various nature-based activities such as hiking, tent camping, cycling, angling, picnicking, and photography. Approximately 1.3 kilometers of trail paths allow visitors to walk around the lake in close contact with nature. The park is also equipped with social and technical infrastructure, including toilets, fountains, picnic tables, water tanks, solar energy panels, containers, and garbage collection areas.

Cultural Context and Surrounding Area

The nearby district of Mudurnu is one of Bolu’s prominent settlements in terms of cultural and social aspects. The tradition of ahilik (artisan fraternity) is still kept alive in the district, and the custom of the tradesmen's prayer is continued every Friday. Traditional crafts such as blacksmithing, coppersmithing, and needle lacework partially maintain their existence. Furthermore, Bolu’s well-developed culinary culture is especially recognized through chefs from Mengen; this culinary heritage extends even to the imperial kitchens.

Tourism and Regional Significance

With its natural landscape, tourism infrastructure, and ease of transportation, Bolu province carries development potential in many areas, including nature, health, winter, and congress tourism. Within this context, Sülüklügöl Nature Park stands out as one of the region’s significant recreational areas with its natural resources and rich scenery. As an area with minimal human impact, it serves as an exemplary nature park for the conservation of natural balance and sustainable use.