The Minami Kantō gas field (南関東ガス田 Minami Kantō gasuden) is a large gas field in Japan, west of Tokyo, in the Chiba prefecture.
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The basin holds the most prolific natural gas reserves in Japan, with ultimate gas production of 375 billion cubic meters.
The drill well yield additional to the natural gas a brine rich in iodine. The iodine is extracted in large scale and makes this area the second largest producer after Chile, where the iodine is extracted from the caliche.[1]