The floodplain is formed by the accumulation of water from the Sakarya River and groundwater springs in the depression between the Karasu and Kaynarca districts.
It is home to the rare 'Acarlar' (Leucojum aestivum) snowflake plant which blooms in the spring.
The water depth within the swamp fluctuates significantly depending on seasonal precipitation and the overflow levels of the river.
It is classified as a RAMSAR-equivalent sensitive wetland area, supporting a high degree of biodiversity including otters and various water snakes.
Acarlar Longozu is the second-largest floodplain forest in Türkiye, covering an area of approximately 1,562 hectares. It functions as a complex ecosystem where the Sakarya River's hydrological regime creates a unique seasonal swamp habitat. The site is designated as a first-degree natural protected area to conserve its rare flora and fauna. Visitors traverse the forest via a long wooden boardwalk that stretches over the marshy ground. It serves as a critical nesting site for numerous migratory bird species throughout the year. The vegetation is dominated by ash, alder, and willow trees adapted to periodic flooding. The surrounding water contains endemic fish species and vast expanses of water lilies.
The mid-point of the wooden boardwalk where the water lily clusters are most dense.
Bring high-quality insect repellent to protect against mosquitoes prevalent in the wetland environment.
Walk the entire length of the wooden platform to reach the deeper, more secluded sections of the marsh.
Visit during the early morning hours to observe the most active bird life before the midday heat.
Do not attempt to leave the marked wooden paths, as the marshland is unstable and poses a sinking hazard.
Open year-round, though the boardwalk can be slippery during heavy rainfall or winter months.
Stay strictly on the designated wooden boardwalks to protect the fragile swamp ecosystem and avoid local wildlife.
