Giresun is a city in the Black Sea Region of northeastern Turkey, about 175 km west of the city of Trabzon. It is the seat of Giresun Province …Giresun is a city in the Black Sea Region of northeastern Turkey, about 175 km west of the city of Trabzon. It is the seat of Giresun Province and Giresun District. It has a population of 125,682. Giresun was known to the ancient Greeks as Choerades or more prominently as Kerasous or Cerasus, the origin of the modern name.