Jisho

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だま
Noun
1. magma reservoir
Wikipedia definition
2. Magma chamberA magma chamber is a large underground pool of liquid rock found beneath the surface of the Earth. The molten rock in such a chamber is under great pressure, and given enough time, that pressure can gradually fracture the rock around it creating outlets for the magma. If it finds a way to the surface, then the result will be a volcanic eruption; consequently many volcanoes are situated over magma chambers.
Read “Magma chamber” on English Wikipedia
Read “マグマ溜り” on Japanese Wikipedia
Read “Magma chamber” on DBpedia

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