Karla (Greek: Κάρλα) is a former municipality in Magnesia, Thessaly, Greece. Since the 2011 local government reform it is part of the municipality Rigas Feraios, of which it is a municipal unit. The municipal unit has an area of 223.591 km2. The population of the municipal unit is 4,747 according to the census (2011). It is an agricultural area producing cereals, cotton and vegetables (28 kilometres away from Volos). The capital of the municipality was Stefanovikeio. The first name of Lake Karla was . This shows that it was dedicated to the sun and the goddess of Light Phoebe who was Leto's mother. Leto was the mother of Apollo who also had the name Phoebus which means the sun.