Parameter Tree:
EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > ESTUARY

Definition:
The place where animals or plants live in a semi-enclosed coastal embayment where fresh and saltwater mix (such as a river mouth estuary).

Reference:
Adapted from Matthew Lerman, Marine Biology, 1986, The Benjamin/Cummings Publishing Company, Inc., Menlo Park, California.