Grandmother Ridge is located at the western end of Stone Cloud Valley. These steep cliffs are the natural western boundary of the Clouded Forest, covered in pine, Ragtrunk Tree and Frillstem Tree, they are insurmountable even for the Ikran.
The Sarentu does not receive any quests related to this location, but can explore the eastern foot of the mountains. One of the Tarsyu shoots is located there.