Ruin Valley (Japanese: いせきのたにRuin Valley) is a route in the Sevii Islands. The Dotted Hole is situated in the central area of the route.
The terrain of Ruin Valley is mainly covered in tall grass. In the center of the valley is the Dotted Hole (containing the Sapphire), which is also surrounded by a small pool of water. There are also some bare patches of earth. This area of Six Island is fairly mountainous, despite there being no actual mountain here, and many hikers can be found exploring this area.