{
  "type": "minecraft:ruined_portal",
  "biomes": "#minecraft:has_structure/ruined_portal_swamp",
  "setups": [
    {
      "air_pocket_probability": 0.0,
      "can_be_cold": false,
      "mossiness": 0.5,
      "overgrown": false,
      "placement": "on_ocean_floor",
      "replace_with_blackstone": false,
      "vines": true,
      "weight": 1.0
    }
  ],
  "spawn_overrides": {},
  "step": "surface_structures"
}