There are several different biomes in Oxygen Not Included. Each contains different resources, creatures, and plants, and are mostly separated by veins of Abyssalite. Although each biome has a color shading applied to it that stays after the biome is mined out, there are no special properties beyond the contents of the biomes (so, for example, the Frozen biome does not cool itself, only starting out cold and cooling through Wheezeworts, which can be removed).
Biome list[edit | edit source]
|Biome||Metal||Rock||Other Resources||Life||Gas Pockets||Border|
|Briar, Blossom, Mealwood, Hatch||Oxygen, Carbon Dioxide, Vacuum|
|Swamp||Thimble Reed, Puft||Oxygen, Polluted Oxygen|
|Caustic||Morb, Pincha Pepper||Chlorine, Hydrogen, Polluted Oxygen|
|Frozen||Wheezewort, Sleet Wheat||Oxygen, Vacuum|
|Volcanic||None||None||None||Oxygen, Polluted Oxygen, Steam|
Biome Descriptions[edit | edit source]
Temperate Biome[edit | edit source]
The Temperate Biome is the place where your Duplicants start. It contains clean Water, Dirt, Sandstone, Sand, Coal, Algae, and Copper (which provides a small decor boost). The Muckroot, Mealwood and Bristle Blossom plants growing naturally here will provide food until you research other Food options. You are guaranteed to start with at least five accessible tiles of Oxylite, which should produce sufficient Oxygen for you to survive until you have researched some Oxygen generation structures, and Algae found here will cover you for about 20 or more cycles after that. Hatches could be slaughtered and eaten too, but they may be more useful for Coal production later. The Temperate biome is bordered by a mixture of Granite and Obsidian, and is located in the center of the map, surrounded by the other biomes.
Swamp Biome[edit | edit source]
Swamps are warmer and have cavities full of Polluted Oxygen, often under high pressure. Pools of Polluted Water and dug up Slime will add even more Polluted Oxygen. You can find more Algae here, useful if you still need it for Oxygen generation, and all that Slime can be converted to Algae, too. The primary rock is Sedimentary Rock, which can be mined quickly due to its low hardness. The Gold Amalgam found here is the most heat-resistant Raw Metal. Thimble Reed grows here, which is crucial for production of Clothes. Swamps are notable for being the only biome that contains Geysers, both for Natural Gas and for Steam.
Caustic Biome[edit | edit source]
This biome is even warmer than the Swamp Biome, and here you can find Pincha Pepper plants that produce Pincha Peppernut for your Cooking Station. The Chlorine and Hydrogen gases in the cavities here are unbreathable. The Bleach Stone found here is useful to keep your Duplicants happy with a Hand Sanitizer, and Phosphorite is used as a fertilizer for Pincha Pepper. Caustic biomes often have large veins of Coal, Igneous Rock, and Iron Ore (which has no special properties compared to other Raw Metals). Morbs can be found here as well.
Frozen Biome[edit | edit source]
In this biome, Duplicants will become stricken with Hypothermia if not wearing a Warm Sweater which can be made in a Textile Factory. The temperature ranges from -20 to -40°C. It contains large amounts of liquifiable Ice, Polluted Ice, and Snow, as well as veins of Granite and Wolframite (both notable for their excellent Heat transfer abilities). For gases, there's Carbon Dioxide and some Oxygen. You can find Sleet Wheat and Wheezewort (plants) here.