The Defereggen Valley, or simply Defereggen, is the middle of the three East Tyrolean high mountain valleys running from east to west. Its parallel-running neighbours are the Puster Valley and the Virgen Valley. The Defereggental is linked by a road called the Defereggentalstraße. Its name is derived from the Celtic word dubar or from the Slavic dober.It lies in the High Tauern National Park and is surrounded by the peaks of the Defereggen range, the Rieserferner Group, the Lasörling Group and the Schober Group. The Schwarzach river flows through the valley.
There are three municipalities in the valley: Hopfgarten in Defereggen, St. Veit in Defereggen and St. Jakob in Defereggen.
Coordinates 46°55'34.967" N 12°22'9.163" E