Transbaikal, Trans-Baikal, Transbaikalia (Russian: Забайка́лье, romanized: Zabaykal'ye, IPA: [zəbɐjˈkalʲjɪ]), or Dauria (Даурия, Dauriya) is a mountainous region to the east of or "beyond" (trans-) Lake Baikal at the south side of the eastern Siberia and the south-western corner of the Far Eastern Russia.
The steppe and wetland landscapes of Dauria are protected by the Daursky Nature Reserve, which forms part of a World Heritage Site named "Landscapes of Dauria".