The Underground Grove is a pathway found inside the walls of the Volcano Obstacle. The Underground Grove is also referred to as the Volcano Grove, Underground Meadow, or even Volcano Sinkage. It is located at a large ring that circles the inside of the walls, but only the front part contains grass. This tunnelling system also goes in a complete circle between the Lava Cavern and the walls of the Volcano, as in an outer-ring.