Located 45 kilometers from Ardahan city center, Lake Çıldır (Çıldır Gölü), a tectonic lake, is at an altitude of 1956 meters above sea level. It is the largest freshwater lake in Eastern Anatolia after Lake Van, with an area of 25 square kilometers. Since the winter season is very challenging in the region, Lake Çıldır freezes in late November, and the ice thickness exceeds one meter. Fishing here is done by drilling ice, offering visitors an extraordinary experience, including activities like horse-drawn sleigh rides. Lake Çıldır lies in a tectonic depression between the Akbaba and Kısır Mountains, with its deepest point reaching 22 meters. The lake is fed by surface waters flowing from the surrounding mountains and by numerous springs. There are four islands of various sizes on the lake, the largest of which is near the ruins in Akçakale. The area is also one of the important bird-watching spots in the region, as it lies on the migration route of the Ruddy Shelduck and Van Lake Seagull species.

Akçakale Island on Çıldır Lake is the island where Sultan Alparslan also named the castle after adding this region to the Seljuk lands. In addition to its natural beauties, it is a bird paradise in terms of bird breeding in summer. The island is also a first degree archaeological site. The remains on the island are estimated to date back to the Neolithic period.

Ardahan Aktaş Lake is one of the natural beauties located in Ardahan province of Türkiye. It is a hidden paradise within the unique nature of the region. The lake, surrounded by lush meadows and mountains, offers visitors a peaceful and serene atmosphere, providing an immersive experience with nature. Aktaş Lake hosts many bird species, making it especially attractive for bird watchers. Additionally, walks around the lake present photographers with impressive shots. The area is ideal for nature lovers, with organized nature walks and camping activities. With its tranquility, peace, and the unique landscape offered by nature, Aktaş Lake is a special destination waiting to be discovered in Ardahan. Aktaş Lake is tectonically formed, with half of the lake within the boundaries of Ardahan and the other half in Georgia. Aktaş Lake is part of the lakes region, which consists of a total of 11 lakes, most of which lie within the borders of Georgia.