The Three Peaks rise on the southern edge of the extensive pinnacle plateau with the Langen Alm (La Grava Longa), an alpine plateau at around 2200 m to 2400 m, which here forms the end of the Rienz Valley (Valle della Rienza). There are three small mountain lakes, the Zinnenseen. This area north of the mountains, from the peaks to the municipality of
Toblach in South Tyrol to the Natural Park of the Three Peaks (up to 2010, the Sesto Dolomites Nature Park), has been a UNESCO World Heritage site since 2009. The ridge of the battlements, which runs in a west-east direction, forms the border with the municipality of
Auronzo di Cadore in the province of
Belluno, which also represents the German-Italian language border. To the northeast, this ridge continues to the 2454 m high Paternsattel (Forcella Lavaredo), where it turns north to the mountains
Passportenkopf (Croda di Passaporto, 2719 m) and
Paternkofel (Monte Paterno, 2744 m). In the west it sits across the Forcella Col di Mezzo (2315 m) transition to the Zinnenkuppe (Col di Mezzo, 2254 m) and on to the 2252 m high Katzenleiterkopf (Croda d'Arghena). To the southwest of the Drei Zinnen, the Forcella Col di Mezzo is followed by the Plano di Longeres plateau above the Valle di Rinbianco, a side valley of the Rienz Valley. Immediately south of the western pinnacle, the Forcella di Longeres saddle (2235 m) separates the Plano di Longeres from the Vallone di Lavaredo, a side valley of the Piave valley. To the south lies the Cadini group.
Cortina d'Ampezzo, 17 kilometers southwest, is the largest city in the area. Other larger towns are
Toblach 13 kilometers northwest and
Innichen 12 kilometers north. ==Cabins and access==