Mt Athamanon, also known as Mt Tzoumerka, is the natural boundary between the Epirus and Thessaly regions. Its one of the longest and most remote parts of the southern Pindos range. The main substrate is limestone, with sporadic appearance of flysch. Its a continuous ridge situated in a NW-SE direction, highest summit being Mt Katafidi at 2393m. In the past the Ori Athamanon were densely forested in recent years however, they have suffered from irrational deforestation due to excessive wood-cutting and grazing. For this reason extensive bare places occur, but despite this we can still find some well forested slopes with coniferous forests, where Taxus baccata exists in small stands or as isolated trees, and broad leaved deciduous forests.