noun
hydrothermal discharge zone
Technical term used in geology and oceanography for areas where hot, mineral-rich water emerges from the seafloor or crust.
深海の熱水湧出域には独特の生態系が存在する。
Unique ecosystems exist in deep-sea hydrothermal discharge zones.
Compound of 熱水 (hot water) + 湧出 (gushing out) + 域 (area, zone).