Volcanic folds

Volcanic folds is a decorative tile used in Factorio to change the visual appearance of the ground; it is categorized as a tile decoration and has no gameplay effects such as pollution, movement cost, or resource production. As a terrain decoration, Volcanic folds is intended solely for aesthetic surface theming and can be placed to create volcanic-style areas or to visually distinguish sections of a factory, but it does not interact with mechanics like belts, buildings, or units.