Glyfada, situated in the Athens Riviera, is a suburban area located in South Athens. It occupies the southern parts of the Athens' Urban Area, stretching from the base of Hymettus mountain to the Saronic Gulf. It holds the distinction of being the largest among the southern suburbs of Athens. Due to its exceptional waterfront position, bustling commercial hub, and contemporary business district, Glyfada has evolved into the focal point of Athens' southern suburbs. It is often referred to as the centerpiece of the 'Athens Riviera' and showcases some of Europe's most luxurious coastal residences, beautiful gardens, and extensive beachfront properties. Additionally, Glyfada boasts a modern marina.

Lake Vouliagmeni, situated to the south of Vouliagmeni, Greece, is a small lake with brackish water. It is fed by underground currents that permeate through Mount Hymettus. The formation of this lagoon dates back approximately 2,000 years when a large cavern collapsed as a result of an earthquake. What makes the lake truly remarkable are its distinctive environmental conditions. Warm seawater, ranging from 28 to 35 degrees Celsius, enters the lake through an underground channel that meanders through a network of submerged caves. As a result, the lake maintains a minimum temperature of 18 degrees Celsius (typically ranging between 21 and 24 degrees Celsius). Additionally, the lake has served as a spa since the late 19th century. Further inside the mountain, there exists an underwater cave that extends deeply, remaining unexplored in its entirety. Even with the use of sonar detection, tracing the cave's end appears to be an impossible task.