User Summary: Raging River Terrain Tray - 2 pack (w/ GRID) is part of the Wildlands wilderness terrain series. Terrain trays are made of thin ferrous metal sheet so the magnetic pieces can stick to it. Different terrain artwork printed on the surface of each side. This item was initially available as an add-on during the Wildlands Kickstarter. Raging River Terrain Tray - 2 pack (w/ GRID) comes with these 2 pieces. (1) Raging River Straight / Mountain Lake 12x12 (w/grid) (1) Raging River Curve / River Mouth 12x12 (w/grid)