An
anchialine pool or
pond (pronounced "AN-key-ah-lin", from
Greek ankhialos, "near the sea") is a landlocked body of water with a subterranean connection to the
ocean. Anchialine pools are a feature of coastal
aquifers which are density stratified, with the water near the surface being fresh or
brackish, and saline water intruding from the coast below at some depth. Depending on the site, it is sometimes possible to access the deeper saline water directly in the anchialine pool or sometimes it may be accessible by
cave diving.