Thessaly is a region in central Greece, and it is the largest region in the country in terms of area. It is situated between the mountains of Pelion and Mount Olympus, stretching from the Pindus Mountains to the Thermaic Gulf. Thessaly is a region with diverse geography, including plains, rivers, and mountains. Important cities in the region include Larissa, Volos, and Karditsa. Thessaly holds historical significance and is often associated with ancient Greek civilization.