The Vanishing Grove was an area of planar importance located at the northern edge of the Sea of Trees, at the edge of the Astralwood. The exact size of the Vanishing Grove was unknown; some speculated that it shifted and changed in size in accordance with nature, extending anywhere from a small grove of trees to a massive wood that stretched hundreds of miles. Its size and location were charted by the Keepers of the Astralwood Enclave, as its borders marked a direct threat to the people of the wood.
The hallmark of the Vanishing Grove was the lingering mist that haunted its areas, obscuring visibility and providing an unnatural chill. This mist was especially prevalent at night, and regardless of season, the temperature and temperament of the area seemed to be permanently trapped in Long Gloom. Most Mortalkind did not dare approach the Grove, including those native to the Sea of Trees, as it was known as one of the most dangerous places within.
The area had a reputation for disappearances; it was thought to house many Fey Crossroads, and the Leylines between the woods and other planes were extremely thin. It was not uncommon for creatures of echoing planes to get caught in the Grove, and come to the Prime Material from the Plane of Shadow, the Deepmists, or the Ethereal Border. Similarly, Material travelers could find themselves transported from their home plane as the mists closed in; these people would usually never be seen again.