The artificial lake of Pournari was formed when the Pournari hydroelectric dam was constructed and stopped the flow of Arachthos river. The dam is the second biggest in Greece after the dam of Mornos, measuring 107 meters high, 580 meters long and 450 meters wide.

The lake hosts a great number of fish and birds, and the visitor has the opportunity to get familiar with it through various activities, such as trekking, fishing, expeditions and canoe-kayaking.