From MTG Salvation Wiki
Oona, queen of Lorwyn's faeries. A wellspring of blue and black mana, the glen is protected by layer upon layer of deceptive glamer and guarded fiercely by the fae. The name of Glen Elendra is known throughout the plane, but most consider the rumors of its existence a prank perpetuated by the faeries.
Due to Oona's protective magic, Glen Elendra was the only location on Lorwyn not changed in the plane's transformation into Shadowmoor.