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  2. Oceanic zone - Wikipedia

    en.wikipedia.org/wiki/Oceanic_zone

    The oceanic zone is typically defined as the area of the ocean lying beyond the continental shelf (e.g. the neritic zone), but operationally is often referred to as beginning where the water depths drop to below 200 metres (660 ft), seaward from the coast into the open ocean with its pelagic zone.

  3. Borders of the oceans - Wikipedia

    en.wikipedia.org/wiki/Borders_of_the_oceans

    The borders of the oceans are the limits of Earth's oceanic waters.The definition and number of oceans can vary depending on the adopted criteria. The principal divisions (in descending order of area) of the five oceans are the Pacific Ocean, Atlantic Ocean, Indian Ocean, Southern (Antarctic) Ocean, and Arctic Ocean.

  4. Marine ecosystem - Wikipedia

    en.wikipedia.org/wiki/Marine_ecosystem

    Marine ecosystems can be divided into many zones depending upon water depth and shoreline features. The oceanic zone is the vast open part of the ocean where animals such as whales, sharks, and tuna live. The benthic zone consists of substrates below water where many

  5. Ocean - Wikipedia

    en.wikipedia.org/wiki/Ocean

    The ocean zones can be grouped by light penetration into (from top to bottom): the photic zone, the mesopelagic zone and the aphotic deep ocean zone: The photic zone is defined to be "the depth at which light intensity is only 1% of the surface value". [12]: 36 This is usually up to a depth of approximately 200 m in the open ocean.

  6. Neritic zone - Wikipedia

    en.wikipedia.org/wiki/Neritic_zone

    The infralittoral zone is the algal-dominated zone down to around five metres below the low water mark. The circalittoral zone is the region beyond the infralittoral, which is dominated by sessile animals such as oysters. The subtidal zone is the region of the neritic zone which is below the intertidal zone, therefore never exposed to the ...

  7. Marine ecoregion - Wikipedia

    en.wikipedia.org/wiki/Marine_ecoregion

    The system covers coastal and continental shelf waters of the world, and does not include deep ocean waters. The MEOW system integrated the biogeographic regionalization systems in use at national or continental scale, like Australia's Integrated Marine and Coastal Regionalisation of Australia and the Nature Conservancy’s system in the ...

  8. Maritime boundary - Wikipedia

    en.wikipedia.org/wiki/Maritime_boundary

    Features, limits and zones. A maritime boundary is a conceptual division of Earth's water surface areas using physiographical or geopolitical criteria. As such, it usually bounds areas of exclusive national rights over mineral and biological resources, [1] encompassing maritime features, limits and zones. [2]

  9. Demersal zone - Wikipedia

    en.wikipedia.org/wiki/Demersal_zone

    The demersal zone is the part of the sea or ocean (or deep lake) consisting of the part of the water column near to (and significantly affected by) the seabed and the benthos. [1] The demersal zone is just above the benthic zone and forms a layer of the larger profundal zone .