Ardeep Forest

The Ardeep Forest, also known as the Faraway Forest, was a relatively small but thick woodland in northwest Faerûn.

wiki reference for Ardeep Forest

While traveling from Nightstone back to Waterdeep,  Raloric notices some ruins or stonework a bit into the Ardeep Forest, Darby mentions that the wood elves there are rumored to be guarding some ancient elven ruins and artifacts. Intrigued, the party elects to remember this area and come back to visit.