Thermopylae is a narrow pass and modern town in Lamia, Phthiotis, Greece. It derives its name from its hot sulphur springs. In Greek mythology the Hot Gates is one of the entrances to Hades.

Lamia is a city in central Greece. The city dates back to antiquity, and is today the capital of the regional unit of Phthiotis and of the Central Greece region. According to the 2021 census, the Municipality of Lamia has a population of 66,657 while Lamia itself has 47,529 inhabitants. The city is located on the slopes of Mount Othrys, near the river Spercheios. It serves as the agricultural center of a fertile rural and livestock area.