adjacent to shoreline aquatic estuarine layer estuarine coastal pycnocline estuarine coastal lower water column CMECS:598 https://cmecscatalog.org/cmecs/classification/unit/598.html envoMarine This class aligns to the Coastal and Marine Ecological Classification Standard (CMECS). In ENVO, we may adapt the definition for consistency, but the semantics (meaning) of the term should be unaffected. Please consult the CMECS catalogue (https://cmecscatalog.org/) for authoritative and semantically unconstrained definitions. "Mid-depth", present in many CMECS classes, is ambiguous and needs refinement. A layer of estuarine water which extends from an estuarine pycnocline or mid-depth to the estuarine bed and from the shore to a fiat boundary where the estuary bed below the water column reaches a depth of 4 meters. envoCmecs