Dasyllio (Greek: Δασύλλιο, before 1927: Μάγερ – Mager)[2][3] is a village and a community of the Grevena municipality.[4] Before the 2011 local government reform it was a part of the municipality of Agios Kosmas, of which it was a municipal district.[5] The 2021 census recorded 20 residents in the village.[1] The community of Dasyllio covers an area of 7.947 km.[6] Dasyllio is a mountain village in the prefecture of Grevena. It is built at an altitude of 1,000 meters on the slopes of Smolikas.