Therma or Thermē (Ancient Greek: Θέρμα, Θέρμη) was a Greek city founded by Eretrians or Corinthians in late 7th century BC in ancient Mygdonia (which was later incorporated into Macedon), situated at the northeastern extremity of a great gulf of the Aegean Sea, the Thermaic Gulf. The city was built amidst mosquito-infested swampland, and its name derives from the Greek thérmē/thérma, "(malarial) fever".