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  2. Watering hole - Wikipedia

    en.wikipedia.org/wiki/Watering_holes

    A watering hole is a natural geological depression where water collects. A watering hole or waterhole is a geological depression in which a body of water forms, usually a pond or a small lake. A watering hole is "a sunken area of land that fills with water". [1] Watering holes may be ephemeral or seasonal.

  3. Watering hole attack - Wikipedia

    en.wikipedia.org/wiki/Watering_hole_attack

    Watering hole is a computer attack strategy in which an attacker guesses or observes which websites an organization often uses and infects one or more of them with malware. Eventually, some member of the targeted group will become infected.

  4. Waterhole - Wikipedia

    en.wikipedia.org/wiki/Waterhole

    Waterhole or water hole may refer to: Watering hole, a depression in the ground in which water can collect, or a more permanent pool in the bed of an ephemeral river; Water hole (radio), an especially quiet region of the electromagnetic spectrum; Waterhole, Alberta, Canada; The Water Hole, a 1928 Western film

  5. Water hole (radio) - Wikipedia

    en.wikipedia.org/wiki/Water_hole_(radio)

    The waterhole, or water hole, is an especially quiet band of the electromagnetic spectrum between 1420 and 1662 megahertz, corresponding to wavelengths of 18–21 centimeters. It is a popular observing frequency used by radio telescopes in radio astronomy .

  6. Depression (geology) - Wikipedia

    en.wikipedia.org/wiki/Depression_(geology)

    A watering hole is a natural depression where water collects and animals come to drink. Karst closed depression with permanent lake Stymfalia, Peloponnese, Greece. Seasonal abundant precipitation drained by 3 sinkholes. In geology, a depression is a landform sunken or depressed below the surrounding area. Depressions form by various mechanisms.

  7. Cenote - Wikipedia

    en.wikipedia.org/wiki/Cenote

    The Sacred Cenote at Chichen Itza, Mexico. Cenotes are surface connections to subterranean water bodies. [5] While the best-known cenotes are large open-water pools measuring tens of meters in diameter, such as those at Chichen Itza in Mexico, the greatest number of cenotes are smaller sheltered sites and do not necessarily have any surface exposed water.

  8. Sinkhole - Wikipedia

    en.wikipedia.org/wiki/Sinkhole

    The Red Lake sinkhole in Croatia. A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer. The term is sometimes used to refer to doline, enclosed depressions that are also known as shakeholes, and to openings where surface water enters into underground passages known as ponor, swallow hole or swallet.

  9. Devils Hole - Wikipedia

    en.wikipedia.org/wiki/Devils_Hole

    Devils Hole pupfish, Cyprinodon diabolis, from Death Valley National Park. Devils Hole is the only natural habitat of the Devils Hole pupfish, which survives despite the hot, oxygen-poor water. [19] Devils Hole "may be the smallest habitat in the world containing the entire population of a vertebrate species". [4]