# IrisRegionRidge > A ridge config ```json { "as": "DEFER", "chance": 0.75, "thickness": 0.125, "scale": 5, "type": "LAND", "shuffle": 16, "chanceShuffle": 128, "chanceScale": 4 } ``` ## biome > The biome name ## type > The type this biome should override (land sea or shore) ## as > What type this spot is (i.e. target SEA but as LAND) like an island. Default matches the target type ## chance > The chance this biome will be placed in a given spot ## scale > The scale of the biome ridge. Higher values = wider veins & bigger connected cells ## chanceScale > The chance scale (cell chances) ## shuffle > The shuffle, how 'natural' this looks. Compared to pure polygons ## chanceShuffle > The chance shuffle (polygon cell chances) ## thickness > The thickness of the vein