The Toxic Jungle is a vast, poisonous forest that appears in Nausicaä of the Valley of the Wind. It constantly threatens the areas where humans can live. The forest is filled with a deadly miasma that chokes all human and animal life. Only those wearing a Shohki Mask or an equivalent to one can hope to survive in this deadly place.
The Sea has several different layers. The "trees" release spores in the afternoon, causing updrafts in the air .
Insects like the Ohmu are unaffected by the miasma and when they travel out of the Toxic Jungle, they bring deadly spores with them that can easily take root in clean lands, which in turn spreads the Sea further. Most communities close to the Toxic Jungle have elaborate methods, including using Fire Wands, to prevent the spread of these deadly spores.
The Toxic Jungle is also colloquially called The Rotwood  by the inhabitants of the Valley of the Wind.
The Toxic Jungle has several layers or strata . The topmost and most poisonous is the Active Layer. The middle layer is still poisonous and is known as the Petrified Layer. The bottom is known as the Vaults. The air is clear and there is no miasma there . The strata is a centuries-long process to turn the poisons of the miasma into "harmless, stable elements...reduced to tiny crystals, too small for the eye to see" and clean the world .
The plants in the Toxic Jungle are made up of various fungi that release deadly spores into a Miasma.
The plants scent food, like dead bodies, and release spores to grow the Toxic Jungle, eventually covering the food with spores . The spores take root in the corpses and the deadly fungus grows.
There are two groups that interact with the Toxic Jungle on a near-daily basis: the Forest People and Worm Handlers.
The Toxic Jungle is constantly spreading. When insects get angry, they go on rampages and inadvertently expose clean land to deadly spores.
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