Location from Curse of Strahd by Tracy & Laura Hickman, Chris Perkins / Wizards of the Coast
The massive iron gates at the eastern entrance to Barovia — they open for those the mists have chosen and close behind them with terrible finality.
The Gates of Barovia are enormous iron constructions set between two weathered stone pillars, each topped with a headless stone statue. They stand at the eastern edge of the valley, where the Old Svalich Road enters the Svalich Woods. The gates open of their own accord for those entering Barovia — the mists have already decided to admit them. They close behind with a sound like a coffin lid. Beyond the gates, the mists press in from all sides. Anyone who tries to leave through them finds themselves turned around, walking back the way they came. The gates are Barovia's threshold — the point of no return.
Also known as: Gates of Barovia, the gates, Barovia's gates