The Reisseck Group is separated from the northern Ankogel Group by the Dösen valley, stretching east of Mallnitz up to the Dösener See alpine lake at a height of , and the Gößgraben gorge down to the Malta Valley. Its eastern boundary is formed by the Malta and Lieser rivers with the town of Gmünd, separating it from the Gurktal Alps (Nock Mountains). To the south, it is bounded by the Möll valley and the neighbouring Kreuzeck Group.