Zonation in a lake.
   Light penetration: photic, aphotic
   Distance from shore: littoral, limnetic
   Water depth: open water (pelagic), bottom (benthic)   Marine zonation.
   Light penetration: photic, aphotic
   Distance from shore: intertidal, neritic, oceanic
   Water depth: open water (pelagic), bottom (benthic, abyssal)