Complete both The Captain's Lament quest, which begins in Isle of Mara and Fond Memories quest, which begins in Obol Plains. You also have to return to Captain Ethan (Captain's Lament).
Steps
Find a Wayward guard, who reports seeing a child heading to the northwest path ( -353, 11, -48 ) Copy/waypoint -353, 11, -48
Find the missing child Qho Augren on top the rock wall at ( -34, 81, 18 ) Copy/waypoint -34.18, 80.53, 17.59