Miles away from Totousai's Layer you will find a huge crater in the ground. There are trees all around it until you get about seven feet from it. This is known as the Jakunen Crater. It was said that InuYasha's father had battled Ryukotsusei, the great dragon demon. InuYasha's father had pinned Ryukotsusei to a tree where InuYasha had to free the great dragon demon and defeat him. This was said to make the crater even deeper to the point that it is almost a hole in the ground.