The National Park of Tzoumerka, Peristeri and Arachthos Gorge occupies an open land area of about 820 km2, stretching across the mountainous regions of Ioannina, Arta and Trikala Prefectures (central part of the Pindos mountain range). Founded in 2009 according to the Presidential Decree (ΦΕΚ 49Δ/12.02.2009).