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A large lake stretched out across a part of Hinamizawa, the village was originally called "Onigafuchi", because of the legends of demons in Hinamizawa's past.
After the Great Hinamizawa Disaster, the supposed reason for the incident was that poisonous gas was released from the Onigafuchi Swamp. The government then drained the swamp and filled it with concrete to prevent another eruption, although this would, in reality, just cause the gas to erupt somewhere else.