This area is found in the northern reaches within the Golden sun: Dark Dawn. You arrive here after adding Himi to your party. Here you use the sight Psyenergy to find your way into the house, and then move the logs and the wardrobe to find Hou Zan on his last breath. (When the short scene is over, go back into the room where you found Hou Zan. walk immediatly back out, but the logs will be in a perfect place for you to reach the treasure chest).
You will also obtain a map which is vital to the quest.