Vouliagmeni Lake is a unique geological phenomenon and part of the National NATURA 2000 list. This natural lake is known for its thermal springs with healing properties, believed to help with musculoskeletal, gynaecological, and dermatological issues. The lake maintains a stable temperature year-round and is home to the Garra Rufa fish, known for their skin exfoliation properties. Visitors can enjoy swimming facilities and various activities organized at the lake.