Vouliagmeni is a seaside suburb and former municipality 20 km south of Athens city centre. Since the 2011 local government reform it is part of the municipality Vari-Voula-Vouliagmeni, of which it is a municipal unit. The municipal unit has an area of 5.805 km2. Its population was 4,332 at the 2021 census. In 1993 and again in 2009, it hosted the annual meeting of the Bilderberg Group. The suburb is named after Lake Vouliagmeni, located in its vicinity. It is one of the most prestigious Athenian suburbs, home to renowned hotels and beaches. The area has some of the highest real estate prices in the Balkans.

Hymettus, also Hymettos, is a mountain range in the Athens area of Attica, East Central Greece. It is also colloquially known as Trellós (crazy) or Trellóvouno ; the latter originates from the French "très long" in awe of its winding length of 16 km, as used by French travelers during the occupation of Greece by the Ottomans. Hymettus was assigned the status of a protected area in the EU's Natura 2000 ecological network.