Helenapolis was the ancient name of Yalova which honored the memory of Emperor Constantine’s mother Helena who designed the entire city of Yalova. Today, Yalova is an important port city, famous for its thermal baths. Termal, in the southwestern part of the city is the thermal district center and the best place in Turkey to take the curative thermal bath waters. In Termal, there’s a wonderful panoramic view of the entire Termal district center from the top of a hill overlooking the city.