Once home to a powerful nation of elves, in 1372 DR, the Yuirwood is the site of ancient ruins of unknown power and origin. It is located in the center of the nation of Aglarond, and is populated by elves and half elves. Sildëyuir is a plane of finite size that is conterminous with the Yuirwood in Faerûn, perhaps two to three hundred miles from end to end, and is home to the Star Elves, a subrace of elves that left Faerûn in antiquity. The ruins in the Yuirwood are the remnants of their original society.