also: かいていだに
noun
submarine valley; submarine canyon
Geological term for a valley or canyon on the seafloor. Used in oceanography and earth science contexts.
海底谷は大陸棚の外縁に多く見られる。
Submarine canyons are often found at the outer edge of continental shelves.
この海底谷は河川の浸食によって形成されたと考えられている。
This submarine valley is thought to have been formed by river erosion.
Compound of 海底 (かいてい, 'seabed') and 谷 (こく, 'valley'). The reading こく for 谷 is the on'yomi used in many geological compounds.