Barovia

What we know

Kingdom; Barovia Village is a village located within it (Session 1 @ 01:08:04)
Scroll at Durst Manor mentioned Strahd von Zarovich, a hidden altar, and a torture dungeon (Session 1 @ 01:53:51)
Party confirmed transport beyond Sword Coast after manor escape (Session 2 @ 03:22:28)
Mist valley with evergreen-clad mountains, rolling thunderclouds, dim gray sunlight (Session 2 @ 03:26:26)
Iron gates with headless statues bear the Ravenloft raven crest of the von Zarovich ruling line (Session 2 @ 02:55:21)
Woods exude silence of a forgotten grave; death smell on the air (Irredel, Sylalys) (Session 2 @ 03:12:02)
Castle Ravenloft rises above Barovia Village on a pillar of stone (Session 2 @ 03:26:26)

Party entered through self-opening raven-crest gates; gates closed behind them (Session 2 @ 03:03:20)

Unconfirmed: whether mist transport brought party into Barovia proper or only near Barovia Village (Session 2 @ 03:22:28)