oceanic abyss

Noun
  1. A long steep-sided depression in the ocean floor (synset 109484445)
    is a type of: depression, natural depression - a sunken or depressed geological formation
    specific instances:
    • atacama trench - a depression in the floor of the Pacific Ocean off the coast of Chile
    • bougainville trench - a depression in the floor of the Pacific Ocean between New Guinea and the Solomon Islands
    • japan trench - a depression in the floor of the Pacific Ocean to the northeast of Japan that reaches depths of 30,000 feet
    • nares deep - a depression in the floor of the Atlantic Ocean to the north of Haiti and Puerto Rico
    same as: deep, trench

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