Tertsa is a small but picturesque coastal settlement, 90 kilometers in the south-east of Heraclion and 25 kilometers in the south of Ierapetra. The village is in the Tertsa valley with the Tsouna winter river. It is under the Sikologos district of the Viannos municipality.

70 people live in the village and their main occupation is agriculture. The area is not very known but, in the last years, its tourist development has started. There are taverns and rooms to let in the settlement.

The beach in Tertsa is sandy, not organized and has many tamarisks for shade. There is a rock that divides it with a smaller one, the Psarocharako beach, is in the south.