return {
  -- metadata
  name = "Birch Forest Underwater",

  -- nodes
  node_dust = nil,
  node_top = "rp_default:sand",
  depth_top = 1,
  node_filler = "rp_default:sand",
  depth_filler = 3,
  node_stone = nil,
  node_riverbed = "rp_default:sand",
  depth_riverbed = 2,

  -- liquids
  node_water_top = nil,
  depth_water_top = nil,
  node_water = nil,
  node_river_water = nil,
  node_cave_liquid = nil,

  -- dungeons
  node_dungeon = nil,
  node_dungeon_alt = nil,
  node_dungeon_stair = nil,

  -- climate
  heat_point = 14,
  humidity_point = 16,

  -- y values
  y_min = -199,
  y_max = 1,
  vertical_blend = nil,
}