In marine geology, a knoll is defined as a rounded underwater hill, not exceeding 1000 meters in height.[1] Any rounded underwater features exceeding that height are referred to as seamounts.[2] They are believed to cover around 16.3% of the world's seafloor.[3]


Orphan Knoll

Graveyard Seamounts


  1. ^ "Standardization of Undersea Feature Names: Guidelines, Proposal Form, and Terminology" (PDF). International Hydrographic Organization. October 2019. Retrieved 2022-02-16.
  2. ^ Government of Canada, Fisheries and Oceans Canada (2019-01-16). "Advisory Committee on Undersea Feature Names". Retrieved 2022-02-16.
  3. ^ "Seamounts and knolls need more research | Earth | EarthSky". 2011-05-15. Retrieved 2022-02-16.